diff --git a/.forgejo/workflows/main.yaml b/.forgejo/workflows/main.yaml
index 45a31dc..45f4b69 100644
--- a/.forgejo/workflows/main.yaml
+++ b/.forgejo/workflows/main.yaml
@@ -1,7 +1,8 @@
 on: [push]
 jobs:
   job:
-    runs-on: bookworm
+    container:
+      image: ${{vars.DOCKER||'docker.io'}}/debian:bookworm
     steps:
     - name: cd
       env: