try tha

.gitea/workflows/dockerfile_runner.yaml

@@ -1,4 +1,4 @@
-name: Gitea Actions Demo
+name: Dockerfile runner
 run-name: ${{ gitea.actor }} is testing out Gitea Actions 🚀
 on:
   push:
@@ -30,6 +30,10 @@ jobs:
           username: ${{ secrets.USERNAME_GITEA }}
           password: ${{ secrets.PASSWORD_GITEA }}
 
+      - name: check docker config
+        run: |
+          cat ~/.docker/config.json
+
       - name: Build and push
         uses: docker/build-push-action@v6
         with: