feat: generate dnsNames from jx-requirements ingress + environments config

[joshuasimon-taulia]

imo, this jx-requirements.yaml file should generate a cert that's compatible with staging.myorg.com and int.myorg.com

  environments:
  - key: dev
    owner: myorg-operations
    repository: jenkins-x-cluster
  - ingress:
      domain: staging.myorg.com
      externalDNS: true
      namespaceSubDomain: .
      tls:
        email: devops@myorg.com
        enabled: true
        production: true
    key: staging
    namespace: staging
  ingress:
    domain: int.myorg.com
    externalDNS: true
    kind: ingress
    namespaceSubDomain: -jx.
    tls:
      email: devops@myorg.com
      enabled: true
      production: true

i probably need tests if this is the accepted solution

[jenkins-x-bot-test]

Hi @joshuasimon-taulia. Thanks for your PR.

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