fix(publish): explicitly link pushed image to this repository

Gitea packages belong to the owner, not a repo, by default — pushing
alone doesn't surface the image under this repo's Packages tab, and
the org.opencontainers.image.source label some workflows set for this
doesn't auto-link on Gitea (closed feature request, never
implemented). Call the link API explicitly after push instead.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

.gitea/workflows/publish.yml

@@ -19,3 +19,14 @@ jobs:
         run: |
           docker build -t git.arthurerlich.de/haylan/godot-ci:4.7.1 .
           docker push git.arthurerlich.de/haylan/godot-ci:4.7.1
+
+      # Gitea packages belong to the owner, not a repo, by default — pushing
+      # the image alone does NOT make it show up under this repo's Packages
+      # tab. Link it explicitly. Non-fatal: a failure here (e.g. already
+      # linked) shouldn't fail a build whose push already succeeded.
+      - name: Link package to this repository
+        run: |
+          curl -sS -X POST \
+            -H "Authorization: token ${{ secrets.REGISTRY_PUSH_PAT }}" \
+            "https://git.arthurerlich.de/api/v1/packages/haylan/container/godot-ci/-/link/godot-ci" \
+            || echo "link step failed (may already be linked) — check manually if needed"