ci: try different username

.gitea/workflows/build.yaml

@@ -21,6 +21,14 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
 
+      # Gitea Actions automatically provides a token that can push to its own registry
+      - name: Log in to the Container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ secrets.CONTAINER_REGISTRY_GITEA_USERNAME }}
+          password: ${{ secrets.CONTAINER_REGISTRY_GITEA_PASSWORD }}
+
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
@@ -30,7 +38,3 @@ jobs:
           context: .
           push: true
           tags: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest
-          registry:
-            url: ${{ env.REGISTRY }}
-            username: ${{ secrets.CONTAINER_REGISTRY_GITEA_USERNAME }}
-            password: ${{ secrets.CONTAINER_REGISTRY_GITEA_PASSWORD }}