finally like this?

.gitea/workflows/build.yaml

@@ -10,11 +10,9 @@ jobs:
     name: Build
     runs-on: ubuntu-latest
     steps:
+    - name: Map docker socket
+      run: ln -s /var/run/user/1000/docker.sock /var/run/docker.sock
 
-    - name: Install prerequisites
-      run: |
-        apt update
-        apt install -y docker
 
     - uses: https://gitea.com/actions/checkout@v4