Add postgres service container for tests

Author: JohnDoneth

.github/workflows/build.yml

@@ -21,6 +21,18 @@ jobs:
         image: lphoward/fake-s3
         ports: ["4569:4569"]
 
+      postgres:
+        image: postgres:16
+        env:
+          POSTGRES_PASSWORD: postgres
+        options: >-
+          --health-cmd pg_isready
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+        ports:
+          - 5432:5432
+
     steps:
       - name: Checkout
         uses: actions/checkout@v2