Import minecraft-server chart for Fleet migration stage 1 (java8 line)

Imports the chart from cluster-config functionally unchanged, wires it into
the publish/validate/install-test pipelines and publishes it as the first of
three Java lines (0.4.0+upjava8).

The only deviation from the source chart is the chart-global scaleDown flag
plus a server.replicas value, following the satisfactory pattern: two of the
three servers stand at 0 replicas in the cluster, which the chart could not
express, and Fleet would otherwise start them on reconcile. The default
(scaleDown: false) still renders replicas: 1, so the rendering of the running
server is unchanged - verified byte-identical against the three real values
files for all three Java lines.

Known deficiencies (hardening, probes, naming scheme, hardcoded values,
missing icon, the misleading mc-router auto-discovery annotations) are left
untouched on purpose and are scheduled for stage 2.

minecraft-server/templates/_helpers.tpl

@@ -0,0 +1,35 @@
+{{/*
+Render the replica count for a Deployment/StatefulSet.
+
+Input: dict
+  "scaleDown"  the chart-global .Values.scaleDown flag (may be nil)
+  "replicas"   the workload's replicas value (may be nil)
+
+Rules (issue #25):
+  - scaleDown: true takes precedence and always yields 0.
+  - otherwise an explicitly set replicas value is used as given, including an
+    explicit 0 — Helm's "default" would swallow 0, hence the explicit
+    kindIs "invalid" nil check.
+  - a missing replicas value defaults to 1.
+
+Usage (the values path to the workload's replicas varies per chart):
+  replicas: {{ include "minecraft-server.replicas" (dict "scaleDown" .Values.scaleDown "replicas" .Values.server.replicas) }}
+
+NOTE: charts in this repo deliberately have no dependencies, so this helper is
+duplicated into every chart's templates/_helpers.tpl with the chart's name as
+define prefix. The reference implementation lives in template-chart.
+
+This chart is a stage-1 import (issue #67) and does not yet follow the repo
+conventions; only the replicas helper was taken over, because the scaleDown
+flag is needed before the Fleet migration. The resources helper follows in
+stage 2 together with the rest of the convention alignment.
+*/}}
+{{- define "minecraft-server.replicas" -}}
+{{- if .scaleDown -}}
+0
+{{- else if not (kindIs "invalid" .replicas) -}}
+{{- .replicas -}}
+{{- else -}}
+1
+{{- end -}}
+{{- end -}}

minecraft-server/templates/init-script-configmap.yaml

@@ -0,0 +1,42 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: {{ .Release.Name }}-init-config
+data:
+  init.sh: |
+    echo "downloading serverpack"
+    wget -O /modpacks/serverpack.zip {{ .Values.curseforgeServerpack.downloadUrl }}
+    SERVERPACK_DIR="{{ .Values.curseforgeServerpack.workingDirectory }}"
+    BACKUP_DIR="/data/serverpack-backup"
+
+    if [ -d "$SERVERPACK_DIR" ]; then
+      echo "found installed server. Migrating..."
+      if [ -d "$BACKUP_DIR" ]; then
+        echo "clearing old Backup"
+        rm -rf $BACKUP_DIR
+      fi
+
+      echo "backing up old server-files"
+      cp -r $SERVERPACK_DIR $BACKUP_DIR
+
+      rm -rf $SERVERPACK_DIR
+      mkdir $SERVERPACK_DIR
+
+      echo "extracting new server-files"
+      tar -xvf /modpacks/serverpack.zip -C $SERVERPACK_DIR
+
+      echo "copying old configuration-data"
+      cp -r $BACKUP_DIR/world $SERVERPACK_DIR/world
+      cp $BACKUP_DIR/banned-ips.json $SERVERPACK_DIR/banned-ips.json
+      cp $BACKUP_DIR/banned-players.json $SERVERPACK_DIR/banned-players.json
+      cp $BACKUP_DIR/ops.json $SERVERPACK_DIR/ops.json
+      cp $BACKUP_DIR/whitelist.json $SERVERPACK_DIR/whitelist.json
+
+      echo "change owner of files"
+      chown -R 1000:1000 $SERVERPACK_DIR
+
+      echo "successfully migrated server"
+
+      # echo "deleting serverpack.zip"
+      # rm /modpacks/serverpack.zip
+    fi

minecraft-server/templates/mc-pvc.yaml

@@ -0,0 +1,11 @@
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: {{ .Release.Name }}-mc-volume-claim
+spec:
+  accessModes:
+    - ReadWriteOnce
+  resources:
+    requests:
+      storage: {{ .Values.minecraft.resources.storage }}
+  storageClassName: longhorn

minecraft-server/templates/mc-secret.yaml

@@ -0,0 +1,6 @@
+apiVersion: onepassword.com/v1
+kind: OnePasswordItem
+metadata:
+  name: {{ .Release.Name }}-mc-secret
+spec:
+  itemPath: {{ .Values.secrets.minecraftServerRef }}

minecraft-server/templates/mc-server-service.yaml

@@ -0,0 +1,25 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ .Release.Name }}-service
+  {{- if .Values.mcRouterIntegration.enabled }}
+  annotations:
+    "mc-router.itzg.me/externalServerName": "{{ .Values.mcRouterIntegration.domain }}"
+  {{- end }}
+spec:
+  selector:
+    app: {{ .Release.Name }}-server-deployment
+  {{- if .Values.mcRouterIntegration.enabled }}
+  ports:
+    - name: mc-port
+      port: 25565
+      targetPort: 25565
+  type: ClusterIP
+  {{- else }}
+  ports:
+    - nodePort: {{ .Values.server.outwardPort }}
+      port: 25565
+      targetPort: 25565
+  type: NodePort
+  {{- end }}
+  

minecraft-server/templates/mc-server-sfs.yaml

@@ -0,0 +1,153 @@
+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: {{ .Release.Name }}-server-deployment
+  labels:
+    app: {{ .Release.Name }}
+spec:
+  replicas: {{ include "minecraft-server.replicas" (dict "scaleDown" .Values.scaleDown "replicas" .Values.server.replicas) }}
+  selector:
+    matchLabels:
+      app: {{ .Release.Name }}-server-deployment
+  template:
+    metadata:
+      name: {{ .Release.Name }}-server-deployment
+      labels:
+        app: {{ .Release.Name }}-server-deployment
+    spec:
+      automountServiceAccountToken: false
+      containers:
+        - name: {{ .Release.Name }}-mc-server-container
+          image: "itzg/minecraft-server:{{ .Chart.AppVersion }}"
+          imagePullPolicy: IfNotPresent
+          ports:
+            - name: mc-port
+              containerPort: 35565
+            - name: minecraft-rcon
+              containerPort: 25575
+            - name: metrics
+              containerPort: 19565
+          env:
+            - name: EULA
+              value: "true"
+            - name: DUMP_SERVER_PROPERTIES
+              value: "true"
+            - name: MOTD
+              value: "{{ .Values.server.motd }}"
+            - name: DIFFICULTY
+              value: {{ .Values.minecraft.difficulty }}
+            {{- if .Values.minecraft.whitelist.enabled }}
+            - name: EXISTING_WHITELIST_FILE
+              value: {{ .Values.minecraft.whitelist.overridePolicy }}
+            - name: WHITELIST
+              value: {{ .Values.minecraft.whitelist.players }}
+            {{- end }}
+            - name: OPS
+              value: {{ .Values.minecraft.management.opPlayers }}
+            - name: EXISTING_OPS_FILE
+              value: "SYNCHRONIZE"
+            - name: RCON_PASSWORD
+              valueFrom:
+                secretKeyRef:
+                  key: rcon-password
+                  name: {{ .Release.Name }}-mc-secret
+            - name: MAX_PLAYERS
+              value: "{{ .Values.minecraft.management.maxPlayers }}"
+            - name: FORCE_GAMEMODE
+              value: "{{ .Values.minecraft.management.forceGameMode }}"
+            - name: SNOOPER_ENABLED
+              value: "false"
+            - name: MODE
+              value: "{{ .Values.minecraft.management.gameMode }}"
+            - name: LEVEL
+              value: "{{ .Values.minecraft.management.worldSaveName }}"
+            - name: SERVER_NAME
+              value: "{{ .Values.minecraft.management.serverName }}"
+            - name: VERSION
+              value: "{{ .Values.minecraft.version }}"
+            - name: ENABLE_RCON
+              value: "false"
+            - name: ENABLE_AUTOPAUSE
+              value: "false"
+            - name: MEMORY
+              value: "{{ .Values.minecraft.resources.memory }}G"
+            {{- if .Values.curseforge.enabled }}
+            - name: TYPE
+              value: "AUTO_CURSEFORGE"
+            - name: CF_API_KEY
+              valueFrom:
+                secretKeyRef:
+                  key: curseforge-api-key
+                  name: {{ .Release.Name }}-mc-secret
+            - name: CF_SLUG
+              value: "{{ .Values.curseforge.modpack.slug }}"
+            - name: CF_FILE_ID
+              value: "{{ .Values.curseforge.modpack.versionId }}"
+            - name: CF_EXCLUDE_MODS
+              value: "{{ .Values.curseforge.modpack.exclude }}"
+            - name: CF_OVERRIDES_EXCLUSIONS
+              value: "{{ .Values.curseforge.modpack.excludeOverride }}"
+            - name: CF_FORCE_INCLUDE_MODS
+              value: "{{ .Values.curseforge.modpack.include }}"
+            - name: CF_FORCE_SYNCHRONIZE
+              value: "{{ .Values.curseforge.forceReload }}"
+            {{- end }}
+            {{- if .Values.curseforgeServerpack.enabled }}
+            - name: TYPE
+              value: "CURSEFORGE"
+            - name: CF_SERVER_MOD
+              value: "/modpacks/serverpack.zip"
+            - name: CF_BASE_DIR
+              value: "{{ .Values.curseforgeServerpack.workingDirectory }}"
+            {{- end }}
+            {{- if .Values.ftb.enabled }}
+            - name: TYPE
+              value: FTBA
+            - name: FTB_MODPACK_ID
+              value: "{{ .Values.ftb.modpackId }}"
+            - name: FTB_MODPACK_VERSION_ID
+              value: "{{ .Values.ftb.versionId }}"
+            {{- end }}
+          resources:
+            requests:
+              cpu: "2"
+              memory: "4Gi"
+              ephemeral-storage: "100Mi"
+            limits:
+              cpu: "4"
+              memory: "12Gi"
+              ephemeral-storage: "200Mi"
+          volumeMounts:
+            - name: "mc-volume"
+              mountPath: /data
+              subPath: mc-data/
+            - name: "mc-volume"
+              mountPath: /modpacks
+              subPath: mc-modpacks/
+      {{- if .Values.curseforgeServerpack }}
+      initContainers:
+        - name: download-serverpack
+          image: alpine
+          command: [ 'sh', '/init/init.sh' ]
+          volumeMounts:
+            - name: "mc-volume"
+              mountPath: /modpacks
+              subPath: mc-modpacks/
+            - name: "mc-volume"
+              mountPath: /data
+              subPath: mc-data/
+            - name: init-script
+              mountPath: /init/init.sh
+              subPath: init.sh
+      {{- end }}
+      restartPolicy: Always
+      volumes:
+        - name: "mc-volume"
+          persistentVolumeClaim:
+            claimName: {{ .Release.Name }}-mc-volume-claim
+        - name: init-script
+          configMap:
+            name: {{ .Release.Name }}-init-config
+  serviceName: {{ .Release.Name }}-service
+
+