Harden pod and container security contexts across all workloads

Add securityContext hardening (runAsNonRoot, readOnlyRootFilesystem,
capabilities drop ALL, allowPrivilegeEscalation false) to the 10 workloads
that lacked it: apache-tika, cyberchef, gotenberg, homeassistant,
matrix-delegation-nginx, paperless-server, paperless-consume cronjob
(plus automountServiceAccountToken false), patchmon-frontend,
urlaubsverwaltung and zipline. All contexts are configurable via
securityContext.pod / securityContext.container in values.yaml; writable
paths are provided as emptyDirs. Image-forced deviations (Home Assistant
root start for s6-overlay + NET_RAW for discovery, paperless root init
container for /run ownership) are documented in the charts' values.yaml.
Major version bump for every changed published chart.

apache-tika/Chart.yaml

@@ -4,5 +4,5 @@ description: A Helm chart to deploy Apache Tika on Kubernetes
 
 type: application
 
-version: 5.0.0+up3.2.3.0.full
+version: 6.0.0+up3.2.3.0.full
 appVersion: "3.2.3.0-full"

apache-tika/templates/deployment.yaml

@@ -16,10 +16,19 @@ spec:
         app: {{ .Release.Name }}-{{ .Chart.Name }}-deployment
     spec:
       automountServiceAccountToken: false
+      securityContext:
+        {{- toYaml .Values.tika.securityContext.pod | nindent 8 }}
       containers:
         - name: {{ .Release.Name }}-{{ .Chart.Name }}-deployment
           image: "apache/tika:{{ .Chart.AppVersion }}"
           imagePullPolicy: IfNotPresent
+          securityContext:
+            {{- toYaml .Values.tika.securityContext.container | nindent 12 }}
+          volumeMounts:
+            # Tika writes temporary files during parsing; with a read-only
+            # root filesystem /tmp must be a writable emptyDir.
+            - name: tmp
+              mountPath: /tmp
           ports:
             - containerPort: 9998
               protocol: TCP
@@ -39,4 +48,7 @@ spec:
               memory: "{{ .Values.tika.resources.limits.memory }}"
               cpu: "{{ .Values.tika.resources.limits.cpu }}"
               ephemeral-storage: "{{ .Values.tika.resources.limits.ephemeralStorage }}"
+      volumes:
+        - name: tmp
+          emptyDir: {}
       restartPolicy: Always

apache-tika/values.yaml

@@ -1,4 +1,18 @@
 tika:
+  # The official image runs as the dedicated user 35002:35002. /tmp is a
+  # writable emptyDir because Tika writes temporary files while parsing.
+  securityContext:
+    pod:
+      runAsNonRoot: true
+      runAsUser: 35002
+      runAsGroup: 35002
+    container:
+      allowPrivilegeEscalation: false
+      readOnlyRootFilesystem: true
+      runAsNonRoot: true
+      capabilities:
+        drop:
+          - ALL
   # Tika answers "GET /" on its server port with HTTP 200.
   livenessProbe:
     httpGet: