(partially tested) fix pg tests, add postgres service in workflows

.github/workflows/build.yaml

@@ -26,6 +26,18 @@ jobs:
             redis:
                 image: "eqalpha/keydb"
                 ports: [ "6379:6379" ]
+            postgres:
+                image: "postgres:latest"
+                env:
+                    POSTGRES_DB: test
+                    POSTGRES_USER: postgres
+                    POSTGRES_PASSWORD: postgres
+                ports: [ "5432:5432" ]
+                options: >-
+                    --health-cmd pg_isready
+                    --health-interval 10s
+                    --health-timeout 5s
+                    --health-retries 5
         steps:
             -   uses: "actions/checkout@v3"
             -   uses: "actions/setup-go@v3"