diff --git a/.forgejo/workflows/flake-check.yml b/.forgejo/workflows/flake-check.yml
index 340cd3d..3b05972 100644
--- a/.forgejo/workflows/flake-check.yml
+++ b/.forgejo/workflows/flake-check.yml
@@ -3,7 +3,9 @@ on: push
 jobs:
   nix_build:
     name: Build Nix targets
-    runs-on: ubuntu:22.04
+    runs-on: docker
+    container:
+      image: ubuntu:22.04
     steps:
       - uses: actions/checkout@v3
       - name: Check Nix flake inputs