add .pre-commi-hooks by @dkorzhov

.github/workflows/book-with-cache.yml

@@ -7,8 +7,20 @@ on:
 
 # This job installs dependencies, build the book, and pushes it to `gh-pages`
 jobs:
+  pre-commit:
+    runs-on: ubuntu-latest
+    if: github.ref == 'refs/heads/master'
+    steps:
+    - uses: actions/checkout@v2
+    - uses: actions/setup-python@v2
+    - uses: pre-commit/action@v2.0.3
+      with:
+        extra_args: --all-files
+
   deploy-book:
     runs-on: ubuntu-latest
+    if: failure() != true
+    needs: [pre-commit]
     steps:
       - name: Checkout branch for build
         uses: actions/checkout@v2

.pre-commit-config.yaml

@@ -0,0 +1,12 @@
+exclude: '.github/|.pre-commit-config.yaml|.gitignore'
+repos:  
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.0.1
+    hooks:
+      - id: check-added-large-files
+      - id: check-docstring-first
+      - id: check-json
+      - id: check-xml
+      - id: end-of-file-fixer
+      - id: trailing-whitespace
+        args: ["--markdown-linebreak-ext=md"]