Add Github Action to calculate changed files (#4438)

* Fix branch diff detection

* Update lint-scripts-pr.yml

.github/workflows/lint-scripts-pr.yml

@@ -23,18 +23,19 @@ jobs:
        - name: Checkout repository
          uses: actions/checkout@v3
          with:
-           ref: ${{ github.event.pull_request.head.sha }}
+           fetch-depth: 2
 
-       - name: Environment variables
-         run: sudo -E bash -c set
+       - name: Get changed files
+         id: changed-files
+         uses: tj-actions/changed-files@v34
 
-       - name: "Shellcheck on changed files"
-         shell: bash {0}
+       - name: List all changed files
          run: |
 
-           for file in $(git diff --name-only master..HEAD); do
-           # We are only interested in BASH scripts
-           if grep -qE "#\!/" $file; then
-               shellcheck $file
-           fi
+           for file in ${{ steps.changed-files.outputs.all_changed_files }}; do
+             if grep -qE "#\!/" $file; then
+
+                 shellcheck $file
+
+             fi
            done