add postgres service to blocking workflow

.github/workflows/rust.yml

@@ -38,6 +38,26 @@ jobs:
     env:
       CARGO_TERM_COLOR: always
 
+    services:
+      # Label used to access the service container
+      postgres:
+        # Docker Hub image
+        image: postgres
+        # Provide the password for postgres
+        env:
+          POSTGRES_PASSWORD: postgres
+          POSTGRES_USER: postgres
+        # Set health checks to wait until postgres has started
+
+        ports:
+          - 5432:5432
+
+        options: >-
+          --health-cmd pg_isready
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+
     strategy:
       matrix:
         toolchain: