ci: fix gitlint range

.github/workflows/main.yaml

@@ -8,6 +8,10 @@ name: Lint
 # yamllint disable-line rule:truthy
 on: [pull_request, push]
 
+concurrency:
+  group: ci-${{ github.ref }}-1
+  cancel-in-progress: true
+
 jobs:
   lint:
     runs-on: ubuntu-latest
@@ -17,11 +21,16 @@ jobs:
       - name: Install OS packages
         # yamllint disable-line rule:line-length
         run: sudo apt-get install -y python3-dev python3-pip shellcheck reuse
+      # gitlint is available on Debian but Ubuntu has an older version.
       - name: Install pip packages
         run: pip3 install salt-lint gitlint
       - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
       - uses: actions/setup-python@v3
       - uses: pre-commit/action@v3.0.0
 
+      # TODO: lint range of commits, not only the latest pushed
       - name: Gitlint
-        run: pwd; gitlint --debug
+        # yamllint disable-line rule:line-length
+        run: gitlint --debug --commits "${{ github.event.before }}..${{ github.sha }}"