Pull postgres docker image before test in CI

Author: ThomWright

.github/workflows/node.js.yml

@@ -26,5 +26,6 @@ jobs:
       with:
         node-version: ${{ matrix.node-version }}
     - run: npm ci
-    - run: npm run build
+    - run: npm run
+    - run: docker pull postgres:9.4
     - run: npm test