add redis service

.github/workflows/python.yml

@@ -18,6 +18,22 @@ jobs:
         py: [3.9, 3.8, 3.7]
       fail-fast: false
 
+    # Service containers to run with `runner-job`
+    services:
+      # Label used to access the service container
+      redis:
+        # Docker Hub image
+        image: redis
+        # Set health checks to wait until redis has started
+        options: >-
+          --health-cmd "redis-cli ping"
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+        ports:
+          # Maps port 6379 on service container to the host
+          - 6379:6379
+
     steps:
       - uses: actions/checkout@v2
         with: