try

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

@@ -6,19 +6,19 @@ on:
       - master
       
 jobs:
-   build:
-     runs-on: cth-ubuntu-latest
-     steps:
-       - name: checkout
-         uses: actions/checkout@v4
-         
-       - name: setup buildx
-         uses: docker/setup-buildx-action@v3
-         with:
-           config-inline: |
-              [registry."192.168.0.151:32000"]
-              http = true
-              insecure = true
+  push:
+    runs-on: cth-ubuntu-latest
+    steps:
+      - name: checkout
+        uses: actions/checkout@v4
+        
+      - name: setup buildx
+        uses: docker/setup-buildx-action@v3
+        with:
+          config-inline: |
+            [registry."192.168.0.151:32000"]
+            http = true
+            insecure = true
               
       - name: Build and push Docker image
         uses: docker/build-push-action@v5