fix: Use POST for Gitea package link API and handle already-linked

The link endpoint uses POST (not PUT) and returns 400 when already
linked. Handle both 204 (linked) and 400 (already linked) as success.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.woodpecker.yml

@@ -271,20 +271,24 @@ steps:
   # Links all Docker packages to the mosaic/stack repository
   # This makes packages visible on the repository page in Gitea
   link-packages:
-    image: alpine:latest
+    image: alpine:3
     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/${package} to repository stack..."
-          curl -X PUT \
+          STATUS=$(curl -s -o /dev/null -w "%{http_code}" -X POST \
             -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 ${package} (may not exist yet)"
+            "https://git.mosaicstack.dev/api/v1/packages/mosaic/container/${package}/-/link/stack")
+          if [ "$STATUS" = "204" ]; then
+            echo "Linked ${package} to stack"
+          elif [ "$STATUS" = "400" ]; then
+            echo "${package} already linked (OK)"
+          else
+            echo "Warning: ${package} link returned $STATUS"
+          fi
         done
     when:
       - branch: [main, develop]