try docker build

.gitea/workflows/ci.yml

@@ -44,13 +44,13 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v4
 
-      - name: Set up Docker Build
+      - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
       - name: Log in to registry
         uses: docker/login-action@v3
         with:
-          registry: ${{ vars.INSTANCE_URL }}
+          registry: ${{ GITHUB_SERVER_URL }}
           username: ${{ github.actor }}
           password: ${{ secrets.REGISTRY_ACCESS_TOKEN }}
 
@@ -58,7 +58,7 @@ jobs:
         uses: docker/build-push-action@v6
         with:
           push: true
-          tags: ${{ vars.INSTANCE_URL }}/tech-reborn/phoenix:${{ github.sha }}
+          tags: ${{ GITHUB_REPOSITORY }}:${{ GITHUB_REF }}
 
   # type-check:
   #   runs-on: ubuntu-latest