fix(ci): missing postgres service

Author: ncrmro

.github/workflows/main.yml

@@ -38,13 +38,14 @@ jobs:
           DATABASE_URL: 'postgres://postgres:postgres@localhost:${{ job.services.postgres.ports[5432] }}/postgres'
   build:
     runs-on: ubuntu-latest
-    postgres:
-      image: postgres:12.3-alpine
-      ports:
-        - 5432:5432
-      env:
-        POSTGRES_PASSWORD: postgres
-      options: --health-cmd pg_isready --health-interval 10s --health-timeout 5s --health-retries 5
+    services:
+      postgres:
+        image: postgres:12.3-alpine
+        ports:
+          - 5432:5432
+        env:
+          POSTGRES_PASSWORD: postgres
+        options: --health-cmd pg_isready --health-interval 10s --health-timeout 5s --health-retries 5
     if: github.ref == 'refs/heads/master'
     needs: test
     env: