feat: Add wait step for database service availability in CI workflow

.gitea/workflows/test.yml

@@ -36,6 +36,42 @@ jobs:
         run: |
           pip install -r requirements.txt
           pip install -r requirements-test.txt
+      - name: Wait for database service
+        env:
+          DATABASE_DRIVER: postgresql
+          DATABASE_HOST: 127.0.0.1
+          DATABASE_PORT: "5432"
+          DATABASE_NAME: calminer_ci
+          DATABASE_USER: calminer
+          DATABASE_PASSWORD: secret
+          DATABASE_SCHEMA: public
+          DATABASE_SUPERUSER: calminer
+          DATABASE_SUPERUSER_PASSWORD: secret
+          DATABASE_SUPERUSER_DB: calminer_ci
+        run: |
+          python - <<'PY'
+          import os
+          import time
+
+          import psycopg2
+
+          dsn = (
+              f"dbname={os.environ['DATABASE_SUPERUSER_DB']} "
+              f"user={os.environ['DATABASE_SUPERUSER']} "
+              f"password={os.environ['DATABASE_SUPERUSER_PASSWORD']} "
+              f"host={os.environ['DATABASE_HOST']} "
+              f"port={os.environ['DATABASE_PORT']}"
+          )
+
+          for attempt in range(30):
+              try:
+                  with psycopg2.connect(dsn):
+                      break
+              except psycopg2.OperationalError:
+                  time.sleep(2)
+          else:
+              raise SystemExit("Postgres service did not become available")
+          PY
       - name: Run database setup (dry run)
         env:
           DATABASE_DRIVER: postgresql