Add CI caching for python environments

.github/workflows/build_deploy.yml

@@ -22,29 +22,21 @@ jobs:
   syntax_check:
     name: Check for syntax errors
     runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        python-version: [3.6]
-        os: [ubuntu-latest, windows-latest, macos-latest]
     steps:
       - uses: actions/checkout@v2
 
-      - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v2
+      - name: Flake8 - Error on syntax errors or undefined names
+        uses: py-actions/flake8@v1.1.0
         with:
-          python-version: ${{ matrix.python-version }}
+          args: --count --select=E9,F63,F7,F82 --show-source --statistics
+          update-pip: "true"
 
-      - name: Install dependencies
-        run: |
-          python -m pip install --upgrade pip
-          python -m pip install flake8
-
-      - name: Lint with flake8
-        run: |
-          # Stop the build if there are Python syntax errors or undefined names
-          flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
-          # Exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
-          flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+      - name: Flake8 - Warn on everything else
+        uses: py-actions/flake8@v1.1.0
+        with:
+          args: --count --exit-zero --max-complexity=10 --statistics
+          max-line-length: 127
+          update-pip: "true"
 
   pytest:
     name: Pytest
@@ -71,7 +63,6 @@ jobs:
       - name: Test with pytest
         run: pytest
 
-
   build_wheels:
     name: Build wheels
     needs: [pytest, matrix_prep]