Add E2E smoke test (#1962)

creates a smoke test for the zabbix data source

closes https://github.com/grafana/data-sources/issues/194

playwright.config.ts

@@ -14,7 +14,7 @@ const pluginE2eAuth = `${dirname(require.resolve('@grafana/plugin-e2e'))}/auth`;
  * See https://playwright.dev/docs/test-configuration.
  */
 export default defineConfig<PluginOptions>({
-  testDir: './tests',
+  testDir: './tests/e2e',
   /* Run tests in files in parallel */
   fullyParallel: true,
   /* Fail the build on CI if you accidentally left test.only in the source code. */
@@ -28,7 +28,7 @@ export default defineConfig<PluginOptions>({
   /* Shared settings for all the projects below. See https://playwright.dev/docs/api/class-testoptions. */
   use: {
     /* Base URL to use in actions like `await page.goto('/')`. */
-    baseURL: 'http://localhost:3000',
+    baseURL: process.env.GRAFANA_URL || `http://localhost:${process.env.PORT || 3000}`,
 
     /* Collect trace when retrying the failed test. See https://playwright.dev/docs/trace-viewer */
     trace: 'on-first-retry',