feat(ci): Add package linking to repository

Link all Docker container packages to the mosaic/stack repository
using Gitea's package API. This makes packages visible on the
repository page and shows which repo they came from.

API endpoint: /packages/{owner}/container/{name}/-/link/{repo_name}

Links created for:
- mosaic/api
- mosaic/web
- mosaic/postgres
- mosaic/openbao
- mosaic/orchestrator

Each package will now show up in the repository's packages tab.

.woodpecker.yml

@@ -264,3 +264,34 @@ steps:
         event: [push, manual, tag]
     depends_on:
       - build
+
+  # ======================
+  # Link Packages to Repository
+  # ======================
+  # Links all Docker packages to the mosaic/stack repository
+  # This makes packages visible on the repository page in Gitea
+  link-packages:
+    image: alpine:latest
+    environment:
+      GITEA_TOKEN:
+        from_secret: gitea_token
+    commands:
+      - apk add --no-cache curl
+      - |
+        # Link all container packages to the repository
+        for package in api web postgres openbao orchestrator; do
+          echo "Linking package mosaic/${package} to repository stack..."
+          curl -X PUT \
+            -H "Authorization: token $GITEA_TOKEN" \
+            -H "Content-Type: application/json" \
+            "https://git.mosaicstack.dev/api/v1/packages/mosaic/container/${package}/-/link/stack" || echo "Failed to link ${package} (may not exist yet)"
+        done
+    when:
+      - branch: [main, develop]
+        event: [push, manual, tag]
+    depends_on:
+      - docker-build-api
+      - docker-build-web
+      - docker-build-postgres
+      - docker-build-openbao
+      - docker-build-orchestrator