no prerequisities anymore?

.gitea/workflows/build.yaml

@@ -8,13 +8,13 @@ name: Build and docker image
 jobs:
   build:
     name: Build
-    runs-on: k8s
+    runs-on: ubuntu-latest
     steps:
 
     - name: Install prerequisites
       run: |
-        apt-get update
-        apt-get install -y xz-utils unzip
+        apt update
+        apt install -y docker
 
     - uses: https://gitea.com/actions/checkout@v4