create new dedidacted checkout action

.gitea/workflows/checkout_ubuntu-image.yml

@@ -0,0 +1,19 @@
+name: checkout_ubuntu-image
+
+on:
+  push:
+    branches: [ main ]
+
+jobs:
+  checkout:
+    runs-on: fedora-cloud-42
+    defaults:
+      run:
+        shell: bash
+    container: 
+      image: docker.gitea.com/runner-images:ubuntu-latest
+
+    steps:
+      - uses: https://git.phyllo.me/devops/checkout@v5
+        with:
+          fetch-depth: 0