Fix for #191 (#192)

* replace git diff with git diff-tree

* Update entrypoint.sh

terraform-static-analysis/entrypoint.sh

@@ -32,8 +32,11 @@ declare -i checkov_exitcode=0
 declare -i tflint_exitcode=0
 declare -i tfinit_exitcode=0
 
+# see https://github.com/actions/runner/issues/2033
+git config --global --add safe.directory /github/workspace
+
 # Identify which Terraform folders have changes and need scanning
-tf_folders_with_changes=`git diff --no-commit-id --name-only -r @^ | awk '{print $1}' | grep '\.tf' | sed 's#/[^/]*$##' | grep -v '\.tf' | uniq`
+tf_folders_with_changes=`git diff-tree --no-commit-id --name-only -r @^ | awk '{print $1}' | grep '\.tf' | sed 's#/[^/]*$##' | grep -v '\.tf' | uniq`
 echo
 echo "TF folders with changes"
 echo $tf_folders_with_changes