Move lint test out of unit test (#682)

Signed-off-by: Kevin Su <[email protected]>

.github/workflows/pythonbuild.yml

@@ -34,14 +34,6 @@ jobs:
         python -m pip install --upgrade pip setuptools wheel
         make setup${{ matrix.spark-version-suffix }}
         pip freeze
-    - name: Lint
-      run: |
-        make lint
-    - name: ShellCheck
-      uses: ludeeus/action-shellcheck@master
-      with:
-        ignore:
-          boilerplate
     - name: Test with coverage
       run: |
         coverage run -m pytest tests/flytekit/unit tests/scripts
@@ -87,7 +79,7 @@ jobs:
         cd plugins/${{ matrix.plugin-names }}
         coverage run -m pytest tests
 
-  docs:
+  lint:
     runs-on: ubuntu-latest
     steps:
       - name: Fetch the code
@@ -96,9 +88,37 @@ jobs:
         uses: actions/setup-python@v2
         with:
           python-version: 3.8
+      - uses: actions/cache@v2
+        with:
+          path: ~/.cache/pip
+          key: ${{ runner.os }}-pip-${{ hashFiles('**/dev-requirements.txt') }}
+          restore-keys: |
+            ${{ runner.os }}-pip-
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
+          pip install -r dev-requirements.txt
+      - name: Lint
+        run: |
+          make lint
+      - name: ShellCheck
+        uses: ludeeus/action-shellcheck@master
+        with:
+          ignore:
+            boilerplate
+
+  docs:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Fetch the code
+        uses: actions/checkout@v2
+      - name: Set up Python 3.8
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.8
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip setuptools wheel
           pip install -r doc-requirements.txt
       - name: Build the documentation
         run: make -C docs html