ci: remove the temporary repository_owner probe, record the measurement

github.repository_owner is populated on this Gitea instance: measured as
"jlab-cluster" (12 characters) in run 282 of validate-charts.yml. The
value is now in the comment above the upload step, so the fact survives
without the step that produced it.

.github/workflows/publish-helm-chart.yml

@@ -79,7 +79,9 @@ jobs:
       #
       # That URL is composed, not stored (#63). charts-url holds only the base
       # up to "/api/packages"; the owner segment comes from
-      # github.repository_owner, so no value pointing at the registry - not even
+      # github.repository_owner - which Gitea does populate: measured as
+      # "jlab-cluster" in run 282 of validate-charts.yml, on a temporary step
+      # that was removed again. So no value pointing at the registry - not even
       # a path segment - lives in this repository, and a second owner on the same
       # instance needs no second setting. The mirror on github.com has Actions
       # switched off, so the publish never runs there; if it ever did, the

.github/workflows/validate-charts.yml

@@ -14,16 +14,6 @@ jobs:
       install-charts: ${{ steps.detect.outputs.install-charts }}
       any-install: ${{ steps.detect.outputs.any-install }}
     steps:
-      # TEMPORARY (#63) - remove before the PR is merged. Measures whether this
-      # forge populates github.repository_owner at all; the publish URL is about
-      # to be composed from it.
-      - name: "TEMPORARY (#63): probe github.repository_owner"
-        env:
-          PROBE_OWNER: ${{ github.repository_owner }}
-        run: |
-          echo "github.repository_owner = [${PROBE_OWNER}]"
-          echo "github.repository       = [${{ github.repository }}]"
-          echo "length = ${#PROBE_OWNER}"
       - name: "Checkout Repository"
         uses: actions/checkout@v7
         with: