fix: only do a Docker Login if the secrets are available

Author: Sam Harrison

.github/workflows/test-and-deploy.yml

@@ -18,46 +18,55 @@ jobs:
     strategy:
       matrix:
         python-version: [ '2.7', '3.5', '3.6', '3.7', '3.8', '3.9' ]
+    env:
+      DOCKER_LOGIN: ${{ secrets.DOCKER_USERNAME && secrets.DOCKER_AUTH_TOKEN }}
     steps:
       - name: Checkout sendgrid-python
         uses: actions/checkout@v2
 
+      - name: Login to Docker Hub
+        if: env.DOCKER_LOGIN
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_AUTH_TOKEN }}
+
       - name: Build & Test
         run: make test-docker version=${{ matrix.python-version }}
 
   deploy:
-      name: Deploy
-      if: success() && github.ref_type == 'tag'
-      needs: [ test ]
-      runs-on: ubuntu-latest
-      steps:
-        - name: Checkout sendgrid-python
-          uses: actions/checkout@v2
+    name: Deploy
+    if: success() && github.ref_type == 'tag'
+    needs: [ test ]
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout sendgrid-python
+        uses: actions/checkout@v2
 
-        - name: Set up Python
-          uses: actions/setup-python@v2
-          with:
-            python-version: '3.6'
+      - name: Set up Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: '3.6'
 
-        - name: Install dependencies
-          run: |
-            python -m pip install --upgrade pip
-            pip install build
-            pip install wheel
-            python setup.py sdist bdist_wheel
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install build
+          pip install wheel
+          python setup.py sdist bdist_wheel
 
-        - name: Create GitHub Release
-          uses: sendgrid/dx-automator/actions/release@main
-          with:
-            footer: '**[pypi](https://pypi.org/project/sendgrid/${version})**'
-          env:
-            GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      - name: Create GitHub Release
+        uses: sendgrid/dx-automator/actions/release@main
+        with:
+          footer: '**[pypi](https://pypi.org/project/sendgrid/${version})**'
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
-        - name: Publish package to PyPI
-          uses: pypa/gh-action-pypi-publish@release/v1
-          with:
-            user: __token__
-            password: ${{ secrets.PYPI_TOKEN }}
+      - name: Publish package to PyPI
+        uses: pypa/gh-action-pypi-publish@release/v1
+        with:
+          user: __token__
+          password: ${{ secrets.PYPI_TOKEN }}
 
   notify-on-failure:
     name: Slack notify on failure