Add actions/checkout@v4.1.1

__test__/verify-submodules-true.sh

@@ -0,0 +1,26 @@
+#!/bin/bash
+
+if [ ! -f "./submodules-true/regular-file.txt" ]; then
+    echo "Expected regular file does not exist"
+    exit 1
+fi
+
+if [ ! -f "./submodules-true/submodule-level-1/submodule-file.txt" ]; then
+    echo "Expected submodule file does not exist"
+    exit 1
+fi
+
+if [ -f "./submodules-true/submodule-level-1/submodule-level-2/nested-submodule-file.txt" ]; then
+    echo "Unexpected nested submodule file exists"
+    exit 1
+fi
+
+echo "Testing persisted credential"
+pushd ./submodules-true/submodule-level-1
+git config --local --name-only --get-regexp http.+extraheader && git fetch
+if [ "$?" != "0" ]; then
+    echo "Failed to validate persisted credential"
+    popd
+    exit 1
+fi
+popd