Actions: attempt to validate PR description tests

Stolen from https://github.com/orgs/community/discussions/84771#discussioncomment-8039595

Author: phillco

.github/workflows/pr-description.yaml

@@ -0,0 +1,28 @@
+name: PR Description Validator
+
+on:
+  pull_request:
+    types: [opened, edited, reopened]
+
+jobs:
+  validate-pr-description:
+    name: Validate PR Description
+    runs-on: ubuntu-latest
+    steps:
+    - name: Set up workspace
+      uses: actions/checkout@v2
+
+    - name: Validate PR Description
+      run: |
+        # Ensure jq is installed
+        sudo apt-get install jq
+
+        # Fetch PR description using jq
+        PR_DESCRIPTION=$(jq -r ".pull_request.body" "$GITHUB_EVENT_PATH")
+        KEYWORD="REQUIRED_KEYWORD"
+
+        # Check for the required keyword in the PR description
+        if [[ $PR_DESCRIPTION = *"<!--"* ]] || [[ $PR_DESCRIPTION = *"-->"* ]]; then
+          echo "Please remove the welcome comment from your PR description."
+          exit 1
+        fi