Skip formatting

.github/workflows/format.yml

@@ -14,20 +14,35 @@ jobs:
   black:
     runs-on: ubuntu-latest
     steps:
+      - uses: dorny/paths-filter@v3
+        id: filter
+        with:
+          filters: |
+            sf:
+              - pennylane_sf/**
+              - tests/**
+              - .pylintrc
+              - Makefile
+              - requirements-ci.txt
+              - requirements.txt
+              - setup.py
       - name: Cancel Previous Runs
         uses: styfle/[email protected]
         with:
           access_token: ${{ github.token }}
 
       - name: Set up Python
+        if: steps.filter.outputs.sf == 'true'
         uses: actions/setup-python@v2
         with:
           python-version: 3.8
 
       - name: Install dependencies
+        if: steps.filter.outputs.sf == 'true'
         run: pip install black
 
       - uses: actions/checkout@v2
 
       - name: Run Black
+        if: steps.filter.outputs.sf == 'true'
         run: black -l 100 pennylane_sf/ --check