pre-commit: Configure and integrate with GitHub Actions

.github/workflows/run_pre_commit.yml

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+# Copyright (C) 2020 Sebastian Pipping <sebastian@pipping.org>
+# Licensed under the MIT license
+
+name: Run pre-commit on all files
+
+on:
+- pull_request
+- push
+
+jobs:
+  run_pre_commit:
+    name: Run pre-commit on all files
+    runs-on: ubuntu-18.04
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Set up Python 3.8
+        uses: actions/setup-python@v1.1.1
+        with:
+          python-version: 3.8
+
+      - name: Install pre-commit
+        run: |-
+          pip install \
+            --disable-pip-version-check \
+            --user \
+            --no-warn-script-location \
+            pre-commit
+          echo "::set-env name=PATH::${HOME}/.local/bin:${PATH}"
+
+      - name: Install pre-commit hooks
+        run: |-
+          pre-commit install --install-hooks
+
+      - name: Run pre-commit on all files
+        run: |-
+          pre-commit run --all-files

.pre-commit-config.yaml

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+# Copyright (C) 2020 Sebastian Pipping <sebastian@pipping.org>
+# Licensed under the MIT license
+
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v3.1.0
+    hooks:
+      - id: check-yaml
+      - id: check-merge-conflict
+      - id: end-of-file-fixer
+        exclude: '^easy_select2/static/easy_select2/vendor/'
+      - id: trailing-whitespace
+
+  - repo: https://gitlab.com/pycqa/flake8
+    rev: 3.8.1
+    hooks:
+      - id: flake8
+        args: ['--show-source']
+        exclude: '^(docs/source/|sampleproject/demoapp/migrations/)'
+
+  - repo: https://github.com/pre-commit/mirrors-isort
+    rev: v4.3.21
+    hooks:
+      - id: isort