fix: add GitHub release creation to workflow

Gitea's push mirroring syncs git objects (branches, tags, commits)
but does not sync GitHub release objects or assets. Since ArtifactHub
needs to download the plugin tarball from the GitHub release URL,
the workflow must create releases on both Gitea and GitHub.

Changes:
- Added "Create GitHub release" step after Gitea release
- Uses GITHUB_TOKEN secret for GitHub API authentication
- Creates release and uploads tarball to GitHub
- Mirroring still handles git data sync

Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

.gitea/workflows/release.yaml

@@ -111,6 +111,36 @@ jobs:
             "${API_URL}/releases/${RELEASE_ID}/assets?name=${TARBALL}"
           echo "Gitea release updated"
 
+      - name: Create GitHub release
+        run: |
+          [ "$SKIP_BUILD" = "true" ] && exit 0
+          # GitHub API to create/update release
+          GITHUB_API="https://api.github.com/repos/cpfarhood/headlamp-polaris-plugin"
+          # Check if release exists
+          RELEASE_DATA=$(curl -sf \
+            -H "Authorization: token ${{ secrets.GITHUB_TOKEN }}" \
+            "${GITHUB_API}/releases/tags/${GITHUB_REF_NAME}" || echo "{}")
+          RELEASE_ID=$(echo "$RELEASE_DATA" | node -e "process.stdin.resume();let d='';process.stdin.on('data',c=>d+=c);process.stdin.on('end',()=>console.log(JSON.parse(d).id||''))")
+
+          if [ -z "$RELEASE_ID" ]; then
+            # Create new release
+            RELEASE_DATA=$(curl -sf -X POST \
+              -H "Authorization: token ${{ secrets.GITHUB_TOKEN }}" \
+              -H "Content-Type: application/json" \
+              "${GITHUB_API}/releases" \
+              -d "{\"tag_name\":\"${GITHUB_REF_NAME}\",\"name\":\"${GITHUB_REF_NAME}\",\"draft\":false,\"prerelease\":false}")
+            RELEASE_ID=$(echo "$RELEASE_DATA" | node -e "process.stdin.resume();let d='';process.stdin.on('data',c=>d+=c);process.stdin.on('end',()=>console.log(JSON.parse(d).id))")
+          fi
+
+          echo "GitHub Release ID: $RELEASE_ID"
+          # Upload tarball to GitHub
+          UPLOAD_URL=$(echo "$RELEASE_DATA" | node -e "process.stdin.resume();let d='';process.stdin.on('data',c=>d+=c);process.stdin.on('end',()=>{const r=JSON.parse(d);console.log(r.upload_url||'https://uploads.github.com/repos/cpfarhood/headlamp-polaris-plugin/releases/${RELEASE_ID}/assets')})" | sed 's/{.*}//')
+          curl -sf -X POST \
+            -H "Authorization: token ${{ secrets.GITHUB_TOKEN }}" \
+            -H "Content-Type: application/gzip" \
+            --data-binary "@${TARBALL}" \
+            "${UPLOAD_URL}?name=${TARBALL}"
+          echo "GitHub release updated"
 
       - name: Update metadata and align tag
         run: |