Added workflow to disallow large PRs

.github/workflows/basic-pr-checks.yml

@@ -0,0 +1,38 @@
+name: "Basic PR checks"
+permissions: read-all
+
+on:
+  pull_request
+
+jobs:
+  disallow-submodules:
+    runs-on: ubuntu-22.04
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.2
+    - name: Check for submodules
+      run: |
+        output=$(git submodule status --recursive 2>&1)
+        if [ ! -z $output ]; then
+          echo $output
+          echo "Submodules are not allowed"
+          exit 1
+        else
+          echo "No submodules found"
+        fi
+  disallow-large-prs:
+    runs-on: ubuntu-22.04
+    steps:
+    - name: Check PR size
+      run: |
+        response=$(curl --get -Ss -H "Authorization: token ${{ secrets.GITHUB_TOKEN }}" -H "Accept: application/vnd.github.v3+json" "https://api.github.com/repos/${{ github.repository }}/pulls/${{github.event.pull_request.number}}")
+        additions=$(echo "$response" | jq -r '.additions')
+        deletions=$(echo "$response" | jq -r '.deletions')
+        total=$(( $additions + $deletions ))
+        echo "$additions lines added; $deletions lines deleted"
+        if (( $total > 500 )); then
+          echo "This PR changed $total lines of code, which is above the recommended limit of 500. Your reviewer may ask you to break it into multiple PRs."
+          exit 1
+        else
+          echo "This PR changed $total lines of code, which meets the recommended limit of 500."
+        fi