chore: Setup objectionjs as ORM

packages/backend/knexfile.ts

@@ -0,0 +1,20 @@
+import appConfig from './src/config/app';
+
+const knexConfig = {
+  client: 'pg',
+  connection: {
+    host: appConfig.postgresHost,
+    port: appConfig.postgresPort,
+    user: appConfig.postgresUsername,
+    password: appConfig.postgresPassword,
+    database: appConfig.postgresDatabase,
+  },
+  migrations: {
+    directory: __dirname + '/db/migrations',
+  },
+  seeds: {
+    directory: __dirname + '/db/seeds',
+  }
+}
+
+export default knexConfig;