Start PostgreSQL server before unittesting

.github/workflows/unittests-postgresql.yaml

@@ -5,6 +5,23 @@ jobs:
   test:
     runs-on: ubuntu-latest
 
+    services:
+      postgres:
+        image: postgres
+
+        env:
+          POSTGRES_PASSWORD: postgres
+          POSTGRES_USER: postgres
+          POSTGRES_DB: bitcoinlib_test
+
+        options: >-
+          --health-cmd pg_isready
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+        ports:
+          - 5432:5432
+
     strategy:
       matrix:
         python: ["3.10"]