Set up a pre-prod environment of impresso-docker-stack in an internal VM

[danieleguido]

Done and tested.

NGINX_PORT=8080
IMPRESSO_MIDDLE_LAYER_TAG=v2.4.0
IMPRESSO_USER_ADMIN_TAG=v2.1.0
IMPRESSO_FRONTEND_TAG=v2.9.5
IMPRESSO_RECSYS_TAG=latest
IMPRESSO_IIIF_WIDGET_TAG=latest
IMPRESSO_PUBLIC_API_TAG=latest

To test we use a local nginx proxy to the test address "impresso-project.internal.ch"

events {
  worker_connections 1024;
}

http {
  server {
      listen 80;
      server_name impresso-project.internal.ch;
      location / {
          proxy_pass http://VM-test:8080/;
      }
  }
}