Added exemption code

Author: lamATnginx

.github/workflows/block-changes.yml

@@ -26,8 +26,34 @@ jobs:
           else 
             echo "CHANGES_DETECTED=false" >> $GITHUB_OUTPUT
           fi
+      - name: Check for exemption for PR created by dot-org-content workflow
+        id: check_exemption
+        run: |
+            LABELS=$(jq -r '.pull_request.labels[].name' "$GITHUB_EVENT_PATH" || echo "")
+            AUTHOR=$(jq -r '.pull_request.user.login' "$GITHUB_EVENT_PATH")
+            TITLE=$(jq -r '.pull_request.title' "$GITHUB_EVENT_PATH")
+            ACCEPTED_LABEL="module_reference"
+            ACCEPTED_AUTHOR="github-actions"
+            ACCEPTED_TITLE="NGINX Plus - Module Ref"
+
+            EXEMPTION=false
+
+            if echo "$LABELS" | grep -q "$ACCEPTED_LABEL"; then
+              echo "Label match..."
+              EXEMPTION=true
+            fi
+            if [[ "$AUTHOR" == "$ACCEPTED_AUTHOR" ]]; then
+              echo "Author match..."
+              EXEMPTION=true
+            fi
+            if [[ "$TITLE" == *"${ACCEPTED_TITLE}"* ]]; then
+              echo "Title match..."
+              EXEMPTION=true
+            fi
+            
+            echo "EXEMPTION=$EXEMPTION" >> $GITHUB_OUTPUT        
       - name: Generate PR comment if changes detected
-        if: steps.check_module_changes.outputs.CHANGES_DETECTED == 'true'
+        if: steps.check_module_changes.outputs.CHANGES_DETECTED == 'true' && steps.check_exemption.outputs.EXEMPTION == 'false'
         uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
         with: 
           script: |
@@ -39,6 +65,6 @@ jobs:
                 body: body,
             });
       - name: Fail job if changes detected
-        if: steps.check_module_changes.outputs.CHANGES_DETECTED == 'true'
+        if: steps.check_module_changes.outputs.CHANGES_DETECTED == 'true' && steps.check_exemption.outputs.EXEMPTION == 'false'
         run: |
           exit 0