[Feature] Change to nginx-unprivileged image for better kubernetes support

[hsolberg]

Solves #1880

Not sure which image-repo you prefer to use, it's using Docker Hub in the pull-request (should be fine since its from a "Verified Publisher" and thus does not count towards the rate limit).

Alternative sources can be found here
Amazon ECR - https://gallery.ecr.aws/nginx/nginx-unprivileged
Docker Hub - https://hub.docker.com/r/nginxinc/nginx-unprivileged
GitHub Container Registry - https://github.com/nginxinc/docker-nginx-unprivileged/pkgs/container/nginx-unprivileged
Quay - https://quay.io/repository/nginx/nginx-unprivileged

[hsolberg]

UI Test fails with the error below. Seems a lot of pull-requests are facing the same issue.

>> - Starting ChromeDriver on port 9515...
>> Error
>>      Response 500 POST /session (28155ms)
   {
     value: {
       error: 'session not created',
       message: 'session not created: This version of ChromeDriver only supports Chrome version 127\n' +
         'Current browser version is 129.0.6668.58 with binary path /opt/google/chrome/chrome',
       stacktrace: ''
     }
  }
>> Error