rebuild map only if python script has changed

.github/workflows/testupdatemap.yml

@@ -11,14 +11,23 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
+      - name: check changed files
+        uses: tj-actions/verify-changed-files@v11.1
+        id: verify-changed-files
+        with:
+          files: |
+             fqcn-fixer.py
       - name: Set up Python 3.9
+        if: steps.verify-changed-files.outputs.files_changed == 'true'
         uses: actions/setup-python@v2
         with:
           python-version: 3.9
       - name: install pyyaml
+        if: steps.verify-changed-files.outputs.files_changed == 'true'
         run: |
           python -m pip install --upgrade pip
           pip install pyyaml
-      - name: run test
+      - name: rebuild fqcn map
+        if: steps.verify-changed-files.outputs.files_changed == 'true'
         run: |
           ./fqcn-fixer.py -f example.yml -u