add full checkout script

action.yml

@@ -5,5 +5,5 @@ runs:
   steps:
     - run: printenv
       shell: bash
-    - run: git init
+    - run: checkout.sh
       shell: bash

checkout.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+
+git init
+git config --global --add safe.directory $GITHUB_WORKSPACE
+git remote add origin $GITHUB_SERVER_URL/$GITHUB_REPOSITORY
+git config --local http.$GITHUB_SERVER_URL/.extraheader "AUTHORIZATION: basic $(echo -n x-access-token:${{ secrets.github_token }} | base64)"
+git -c protocol.version=2 fetch --no-tags --prune --no-recurse-submodules --depth=1 origin +$GITHUB_SHA:refs/remotes/origin/$GITHUB_REF_NAME
+git sparse-checkout disable
+git config --local --unset-all extensions.worktreeConfig
+git checkout --progress --force -B $GITHUB_REF_NAME refs/remotes/origin/$GITHUB_REF_NAME
+git log -1 --format=%H
+ls -lh