ci: add workflow to check db freshness

.github/workflows/check_outdated_build_db.yaml

@@ -0,0 +1,31 @@
+name: Check outdated build db
+
+on:
+  push:
+
+jobs:
+  compare_files:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Build db
+        run: | 
+          python3 create_app_list/main.py --output_file out.json 
+      - name: Compare Files
+        run: |
+          # Compare two files using diff
+          diff -q out.json build_files/build.json
+          
+          # Store the exit code of the diff command
+          DIFF_EXIT_CODE=$?
+          
+          # If exit code is 0, files are the same; if not, they are different
+          if [ $DIFF_EXIT_CODE -ne 0 ]; then
+            echo "Files are different!"
+            exit 1  # Fail the workflow
+          else
+            echo "Files are the same!"
+          fi