fix: parameterize integration tests' db credentials (#319)

* add: read db credentials from .env

* remove: console.log

* fix: default to default pg user and password

integration-tests/package-lock.json

@@ -0,0 +1,14 @@
+{
+  "name": "integration-tests",
+  "version": "1.0.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "dotenv": {
+      "version": "10.0.0",
+      "resolved": "https://registry.npmjs.org/dotenv/-/dotenv-10.0.0.tgz",
+      "integrity": "sha512-rlBi9d8jpv9Sf1klPjNfFAuWDjKLwTIJJ/VxtoTwIR6hnZxcEOQCZg2oIL3MWBYw5GpUDKOEnND7LXTbIpQ03Q==",
+      "dev": true
+    }
+  }
+}