add simple checkout workflow

workflows/checkout.yml

@@ -0,0 +1,15 @@
+name: checkout
+
+on: 
+  push:
+    tags:
+      - '*'
+
+jobs:
+  checkout:
+    runs-on: ubuntu-latest:docker://docker.gitea.com/runner-images:ubuntu-latest
+
+    steps:
+      - uses: https://git.phyllo.me/actions/checkout@v4
+        with:
+          fetch-depth: 0