finally like this?

.gitea/workflows/build.yaml

@@ -8,15 +8,16 @@ name: Build and docker image
 jobs:
   build:
     name: Build
-    runs-on: ubuntu-latest
+    runs-on: k8s
+    container: ubuntu:latest
     steps:
 
-    - name: Install prerequisites
-      run: |
-        apt update
-        apt install -y docker
+    # - name: Install prerequisites
+    #   run: |
+    #     apt update
+    #     apt install -y docker
 
-    - uses: https://gitea.com/actions/checkout@v4
+    # - uses: https://gitea.com/actions/checkout@v4
 
     - name: Docker login
       uses: docker/login-action@v3