chore: make CI run pre-commit

Author: agateau-gg

.github/workflows/ci.yaml

@@ -19,6 +19,9 @@ jobs:
 
       - name: Run pre-commit
         run: pipx run pre-commit run --all-files --show-diff-on-failure
+        env:
+          # SKIP ggshield check: it's done by the "scanning" job
+          SKIP: ggshield
 
   build-and-test:
     runs-on: ${{ matrix.os }}