feat: improve build performance (#7192)

* feat: improve build performance
* feat: add cache in all runners

More detail here: https://github.blog/changelog/2021-11-23-github-actions-setup-python-now-supports-dependency-caching/

.github/workflows/docs.yml

@@ -12,7 +12,8 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v2
         with:
-          python-version: 3.9
+          python-version: '3.9'
+          cache: 'pip'
       - name: Cache dependencies
         uses: actions/cache@v2
         with:

.github/workflows/linters.yml

@@ -13,6 +13,7 @@ jobs:
         uses: actions/setup-python@v2
         with:
           python-version: 3.9
+          cache: 'pip'
       - run: pip install --upgrade flake8
       - name: flake8
         uses: liskin/gh-problem-matcher-wrap@v1

.github/workflows/test.yml

@@ -38,6 +38,7 @@ jobs:
       uses: actions/setup-python@v2
       with:
         python-version: ${{ matrix.python-version }}
+        cache: 'pip'
     - name: Install dependencies
       run: |
         sudo apt install gettext gcc -y
@@ -89,6 +90,7 @@ jobs:
       uses: actions/setup-python@v2
       with:
         python-version: ${{ matrix.python-version }}
+        cache: 'pip'
     - name: Install dependencies
       run: |
         sudo apt install gettext gcc -y
@@ -129,6 +131,7 @@ jobs:
       uses: actions/setup-python@v2
       with:
         python-version: ${{ matrix.python-version }}
+        cache: 'pip'
     - name: Install dependencies
       run: |
         sudo apt install gettext gcc -y