fix: update CI workflow to trigger on tag push

Matches core-api workflow pattern for auto release/build on version tags.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.gitea/workflows/build.yml

@@ -1,8 +1,9 @@
 name: Build and Push
 
 on:
-  release:
-    types: [published]
+  push:
+    tags:
+      - 'v*'
 
 jobs:
   release:
@@ -15,9 +16,10 @@ jobs:
             -H "Content-Type: application/json" \
             -d '{"tag_name": "${{ github.ref_name }}", "name": "Release ${{ github.ref_name }}", "body": "Automated release for ${{ github.ref_name }}"}' \
             "${{ github.server_url }}/api/v1/repos/${{ github.repository }}/releases"
-            
+
   build:
     runs-on: ubuntu-latest
+    needs: release
     steps:
       - uses: actions/checkout@v4