try

.gitea/workflows/build-an-push.yaml

@@ -12,6 +12,16 @@ jobs:
     steps:
       - name: checkout
         uses: actions/checkout@v4
+      - run: docker context create builders
+      - name: setup buildx
+        uses: docker/setup-buildx-action@v3
+        with:
+           version: latest
+           endpoint: builders
+          config-inline: |
+            [registry."192.168.0.151:32000"]
+            http = true
+            insecure = true
               
       - name: Build and push Docker image
         uses: docker/build-push-action@v5