Allow proxy service to handle primary server other than Nginx

[CGoodwin90]

Updated the proxy service to be able to assign primary routes to services other than Nginx.

The primary server can be defined in .lando.yml:

name: lando-services
recipe: lagoon
services:
  node:
    command: yarn run start
    primary: true
  ruby:
    command: ruby -run -e httpd / -p 3000
    port: 3000
    primary: false
  python:
    command: python -m http.server 8800
    port: 8800
    primary: false

If the primary server is not defined, it will fallback to a priority list of other services - nginx, node etc.

[netlify[bot]]

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[pirog]

@CGoodwin90 does lagoon have a concept of "primary service"? if so where does that live in the config? Can we not just use that concept and map it over to Lando?

If not, In Lando 4 we are going to use the following to indicate the "primary" service. it might be worth adopting this convention in the lagoon plugin logic so its easier when we move everything to use the new lando 4 services api.

landofile

services:
  service1:
    primary: false
  service2:
    primary: true
  ...
  serviceN:

[CGoodwin90]

Thanks @pirog - I've updated this now to match the logic in Lando 4