Consider adding ca-certificate chain to Configuring SSL/TLS Certificates

[chrislaick]

As outlined in GitHub Discussions #329 there is a new CA Certificate chain provided by the cert provider via OCIO (July 2025).

It would be handy to place this chain order in the Private Cloud Tech Docs here: https://developer.gov.bc.ca/docs/default/component/platform-developer-docs/docs/build-deploy-and-maintain-apps/deploy-an-application/#3-configuring-ssltls-certificates

tls:
    termination: edge
    certificate: |-
      -----BEGIN CERTIFICATE-----
      URL
      -----END CERTIFICATE-----
    key: |-
      -----BEGIN PRIVATE KEY-----
      KEY
      -----END PRIVATE KEY-----
    caCertificate: |-
      -----BEGIN CERTIFICATE-----
      OV TLS CA
      -----END CERTIFICATE-----
      -----BEGIN CERTIFICATE-----
      USERTrust RSA
      -----END CERTIFICATE-----
      -----BEGIN CERTIFICATE-----
      Sectigo Public Server Root
      -----END CERTIFICATE-----
    insecureEdgeTerminationPolicy: Redirect