try docker build

.gitea/workflows/ci.yml

@@ -50,8 +50,8 @@ jobs:
       - name: Log in to registry
         uses: docker/login-action@v3
         with:
-          registry: ${{ vars.GITEA_DOMAIN }}
-          username: ${{ vars.REGISTRY_USERNAME }}
+          registry: gitea:3000
+          username: ${{ github.actor }}
           password: ${{ secrets.REGISTRY_ACCESS_TOKEN }}
 
       # - name: Build and push image