Add Config File to Playwright Installation
Currently, we set the env variable `PLAYWRIGHT_baseUrl` in the docker compose file. This works, but we have to set the `baseURL` in the config file as well. Otherwise, we cannot use the `goto` command relatively. We always must use
```
// Without baseURL
await page.goto(process.env.PLAYWRIGHT_baseUrl + '/login');
// With baseURL configured
await page.goto('/login');
```
See doc: https://playwright.dev/docs/test-configuration
issue