fix(ci): resolve image name from $GITHUB_REPOSITORY, not repository.name

The weekly cron build failed at "Build & push":
  invalid tag "192.168.0.2:1234/justin/:2026.08.03": invalid reference format

github.event.repository.name is EMPTY on schedule events in Gitea (only
workflow_dispatch populates the event payload), so the image tag collapsed
to ".../justin/:<tag>" → invalid → build failed. That's why manual dispatch
refreshes passed while every weekly cron run failed — and since scrape →
index → commit all run before the build, the corpus kept updating on main
each week but the image never shipped.

Fix (mirrors morpheus-docs PR #7):
  - Add a "Resolve repo identity" step deriving owner/name from
    $GITHUB_REPOSITORY (set on ALL event types).
  - Repoint all 7 refs per file (image name, 2 OCI labels, package-link
    OWNER/PKG, prune --owner/--package) to steps.repo.outputs.{owner,name}.
  - Drop the now-unused IMAGE env.
  - Same fix applied to image-only.yml (dispatch-only, so not failing today,
    but the same latent footgun).

Verified: YAML valid; no github.event.repository.name template refs remain.

Co-Authored-By: Claude Opus 4.8 <[email protected]>
Claude-Session: https://claude.ai/code/session_01MNQRS6F7N9Uwh1SMn3xz2g

.gitea/workflows/image-only.yml

@@ -18,7 +18,9 @@ env:
   # body cap. PULL uses the public hostname (HTTPS). Same Gitea registry.
   REGISTRY_PUSH: 192.168.0.2:1234
   REGISTRY_PULL: git.jpaul.io
-  IMAGE: ${{ github.repository_owner }}/${{ github.event.repository.name }}
+  # Image name resolved at runtime from $GITHUB_REPOSITORY (see the "Resolve
+  # repo identity" step). github.event.repository.name is empty on non-
+  # workflow_dispatch events in Gitea, so it's avoided (matches refresh.yml).
   # Two GPU-pinned Ollama containers on the Gitea host — same infra
   # zerto-docs uses. :11435 = Titan X, :11436 = 1080 Ti. Indexer
   # round-robins per batch.
@@ -38,6 +40,15 @@ jobs:
           # Full history so digest-history can walk git log.
           fetch-depth: 0
 
+      # Derive owner/repo from $GITHUB_REPOSITORY (set on all event types),
+      # not github.event.repository.name (empty on non-dispatch events).
+      - name: Resolve repo identity
+        id: repo
+        run: |
+          echo "owner=${GITHUB_REPOSITORY%%/*}" >> "$GITHUB_OUTPUT"
+          echo "name=${GITHUB_REPOSITORY##*/}"  >> "$GITHUB_OUTPUT"
+          echo "resolved repo identity: ${GITHUB_REPOSITORY}"
+
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
@@ -95,14 +106,14 @@ jobs:
         id: meta
         uses: docker/metadata-action@v5
         with:
-          images: 192.168.0.2:1234/${{ github.repository_owner }}/${{ github.event.repository.name }}
+          images: 192.168.0.2:1234/${{ steps.repo.outputs.owner }}/${{ steps.repo.outputs.name }}
           tags: |
             type=raw,value=latest
             type=sha,prefix=,format=short
             type=raw,value={{date 'YYYY.MM.DD'}}
           labels: |
-            org.opencontainers.image.source=https://git.jpaul.io/${{ github.repository_owner }}/${{ github.event.repository.name }}
-            org.opencontainers.image.url=https://git.jpaul.io/${{ github.repository_owner }}/${{ github.event.repository.name }}
+            org.opencontainers.image.source=https://git.jpaul.io/${{ steps.repo.outputs.owner }}/${{ steps.repo.outputs.name }}
+            org.opencontainers.image.url=https://git.jpaul.io/${{ steps.repo.outputs.owner }}/${{ steps.repo.outputs.name }}
 
       - name: Build & push (amd64)
         uses: docker/build-push-action@v6
@@ -117,8 +128,8 @@ jobs:
         env:
           GITEA_TOKEN: ${{ secrets.REGISTRY_TOKEN }}
         run: |
-          OWNER="${{ github.repository_owner }}"
-          PKG="${{ github.event.repository.name }}"
+          OWNER="${{ steps.repo.outputs.owner }}"
+          PKG="${{ steps.repo.outputs.name }}"
           code=$(curl -s -o /tmp/link.out -w "%{http_code}" -X POST \
             -H "Authorization: token ${GITEA_TOKEN}" \
             "https://git.jpaul.io/api/v1/packages/${OWNER}/container/${PKG}/-/link/${PKG}")
@@ -135,7 +146,7 @@ jobs:
           GITEA_TOKEN: ${{ secrets.REGISTRY_TOKEN }}
         run: |
           python scripts/registry_gc.py \
-            --owner "${{ github.repository_owner }}" \
-            --package "${{ github.event.repository.name }}" \
+            --owner "${{ steps.repo.outputs.owner }}" \
+            --package "${{ steps.repo.outputs.name }}" \
             --keep-days 90 \
             --keep-latest 5