add github workflow

.github/workflows/pre-commit.yml

@@ -0,0 +1,45 @@
+name: pre-commit
+
+on:
+  pull_request:
+    branches:
+      - "18.0*"
+  push:
+    branches:
+      - "18.0"
+
+jobs:
+  pre-commit:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+      - name: Get python version
+        run: echo "PY=$(python -VV | sha256sum | cut -d' ' -f1)" >> $GITHUB_ENV
+      - uses: actions/cache@v4
+        with:
+          path: ~/.cache/pre-commit
+          key: pre-commit|${{ env.PY }}|${{ hashFiles('.pre-commit-config.yaml') }}
+      - name: Install pre-commit
+        run: pip install pre-commit
+      - name: Run pre-commit
+        run: pre-commit run --all-files --show-diff-on-failure --color=always
+        env:
+          # Consider valid a PR that changes README fragments but doesn't
+          # change the README.rst file itself. It's not really a problem
+          # because the bot will update it anyway after merge. This way, we
+          # lower the barrier for functional contributors that want to fix the
+          # readme fragments, while still letting developers get README
+          # auto-generated (which also helps functionals when using runboat).
+          # DOCS https://pre-commit.com/#temporarily-disabling-hooks
+          SKIP: oca-gen-addon-readme
+      - name: Check that all files generated by pre-commit are in git
+        run: |
+          newfiles="$(git ls-files --others --exclude-from=.gitignore)"
+          if [ "$newfiles" != "" ] ; then
+              echo "Please check-in the following files:"
+              echo "$newfiles"
+              exit 1
+          fi