test docker in docker

workflows/docker-in-docker.yml

@@ -0,0 +1,16 @@
+name: checkout
+
+on: 
+  push:
+    tags:
+      - '*'
+
+jobs:
+  checkout:
+    runs-on: ubuntu-latest:docker://docker.gitea.com/runner-images:ubuntu-latest
+    container:
+      image: git.phyllo.me/roots/fedora-iso-creation:42
+    steps:
+    - uses: https://git.phyllo.me/actions/checkout@v4
+    - name: Setup tmate session
+    - uses: https://github.com/mxschmitt/action-tmate@v3