ci: start Postgres via docker-compose.test.yml so CI and local share one config

Author: chutch3

.github/workflows/run-tests.yml

@@ -13,24 +13,13 @@ jobs:
     defaults:
       run:
         working-directory: ./api
-    services:
-      postgres:
-        image: postgres:15-alpine
-        env:
-          POSTGRES_USER: kenku
-          POSTGRES_PASSWORD: kenku_test
-          POSTGRES_DB: postgres
-        ports:
-          - 5433:5432
-        options: >-
-          --health-cmd pg_isready
-          --health-interval 5s
-          --health-timeout 5s
-          --health-retries 5
     steps:
       - name: Checkout
         uses: actions/checkout@v6
 
+      - name: Start Postgres
+        run: docker compose -f docker-compose.test.yml up -d --wait
+
       - name: Set up .NET
         uses: actions/setup-dotnet@v5
         with: