CI: install dependencies of postgis-gtfs-importer 💚

Author: derhuerst

.github/workflows/test.yml

@@ -56,6 +56,10 @@ jobs:
         PGDATABASE: postgres
 
     - run: npm install
+    - name: npm install (postgis-gtfs-importer)
+        run: |
+        cd postgis-gtfs-importer
+        npm install --production
 
     - run: npm run lint
     - run: npm test