finally like this?

.gitea/workflows/build.yaml

@@ -8,23 +8,30 @@ 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
+
     - uses: https://gitea.com/actions/checkout@v4
 
-    - name: Login to Docker Registry
+    - name: Docker login
       uses: docker/login-action@v3
       with:
-        registry: git.kluster.moll.re
-        username: ${{ gitea.repository_owner }}
-        password: ${{ secrets.GITEA_TOKEN}}
+        registry: docker.io
+        username: ${{ secrets.docker_username }}
+        password: ${{ secrets.docker_password }}
 
     - name: Set up Docker Buildx
-      uses: docker/setup-buildx-action@v3
+      uses: https://github.com/docker/setup-buildx-action@v3
 
-    - name: Build and push
-      uses: docker/build-push-action@v5
+    - name: Build
+      uses: https://github.com/docker/build-push-action@v2
       with:
         context: frontend
-        tags: git.kluster.moll.re/renoll/moll.re/frontend:latest
+        tags: ${{ secrets.docker_registry }}/frontend:latest
+        push: true