Add pre-commit configuration

'pre-commit' tool [1] provides an extensible way to configure hooks
which can be run automatically before each commit. That way we can make
sure that code send to review is passing base static analysis checks
like e.g. bandit, flake8 or hacking.

For now this is optional to use and not integrated in e.g. tox.ini file
but we can integrate it there too as next step.

[1] https://pre-commit.com/

Change-Id: I7c39d9ff9f735483b1ae9c351e2b945b9f534910

Author: slawqo

.pre-commit-config.yaml

@@ -0,0 +1,41 @@
+---
+default_language_version:
+  # force all unspecified python hooks to run python3
+  python: python3
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.5.0
+    hooks:
+      - id: trailing-whitespace
+      - id: mixed-line-ending
+        args: ['--fix', 'lf']
+        exclude: '.*\.(svg)$'
+      - id: check-byte-order-marker
+      - id: check-executables-have-shebangs
+      - id: check-merge-conflict
+      - id: debug-statements
+      - id: check-yaml
+  - repo: https://github.com/lucas-c/pre-commit-hooks
+    rev: v1.5.4
+    hooks:
+      - id: remove-tabs
+        exclude: '.*\.(svg)$'
+  - repo: local
+    hooks:
+      - id: flake8
+        name: flake8
+        additional_dependencies:
+          - hacking>=6.1.0,<6.2.0
+        language: python
+        entry: flake8
+        files: '^.*\.py$'
+        exclude: '^(doc|releasenotes|tools)/.*$'
+# todo(slaweq): enable pylint check once all issues in the current code will
+# be solved
+#     - id: pylint
+#       name: pylint
+#       entry: pylint
+#       files: ^ovn_octavia_provider/
+#       language: system
+#       types: [python]
+#       args: ['--rcfile=.pylintrc', '--output-format=colorized']