Feature/custom certs

[rustyjux]

Description

Fixes:

• Allow custom certificates to be used for routes #125

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Documentation (non-breaking change with enhancements to documentation)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have checked that unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

Further comments

[rustyjux]

Currently deployed in dev (Silver, Gold/DR) at 5ba7708

Can see example route in Gold - https://console.apps.gold.devops.gov.bc.ca/k8s/ns/b8840c-dev/routes/wild-ns-gw-41c0c-webapps.gov.bc.ca from:

# contains .api.gov.bc.ca certificate which is also valid for webapps.gov.bc.ca
certificates:
  - cert: "NORMAL_DATA_API_CERT"
    key: "NORMAL_DATA_API_KEY"
    tags: [ns.gw-41c0c]
    id: 73600400-dc9b-45be-9518-47cb0e6b203e
    snis:
      - name: webapps.gov.bc.ca
        id: 79009c9e-0f4d-40b5-9707-bf2fe9f50502
        tags: [ns.gw-41c0c]
services:
  - name: that-custom-one
    host: httpbin.org
    tags: [ns.gw-41c0c]
    port: 443
    protocol: https
    routes:
      - name: test-aps-webapps
        tags: [ns.gw-41c0c, random]
        hosts:
          - webapps.gov.bc.ca
  - name: another-non-custom-one
    host: httpbin.org
    tags: [ns.gw-41c0c]
    port: 443
    protocol: https
    routes:
      - name: that-non-custom-one
        tags: [ns.gw-41c0c]
        hosts:
          - new.api.gov.bc.ca