End-to-end test setup (#4833)

* First start on test setup

* Setup e2e runner framework

* Use prepublishOnly for docs build

* Setup docker-based e2e test runner

* Spacing

* Setup db-getter + config

* Build image in Dockerode, pull images if needed

* Fix waiting for DB, run test for each running instance

* Get tests running per vendor

* Temp remove oracle

* Close awaiting connections in between

e2e-tests/api/ping.test.ts

@@ -0,0 +1,17 @@
+import request from 'supertest';
+import { getURLsToTest } from '../get-urls-to-test';
+
+describe('/server', () => {
+	it('/ping', () =>
+		Promise.all(
+			getURLsToTest().map((url) =>
+				request(url)
+					.get('/server/ping')
+					.expect('Content-Type', /text\/html/)
+					.expect(200)
+					.then((response) => {
+						expect(response.text).toBe('pong');
+					})
+			)
+		));
+});