[SECURESIGN-570] Rekor add options to set trillian_log_server

[tommyd450]

#79
First actual pass at a pr for this, creating the yaml with the "externalTrillian" field added as well as providing the treeID of that trillian instance worked seemingly though I would love for someone else to take a brief look.

My process for testing this was installing the helm chart and pointing the the operators rekor-server at the trillian-system namespace and providing its TreeID.

[osmman]

I think it will be better to change the API to something like this:

spec:
   trillian:
      address: trillian.example.com
      port: 8091

current state has problem that Trillain instance has to be installed in same cluster as Rekor which is unnecessary limitation. It will be much more flexibel for example:

• set ip address instead of dns record
• usage of API Gateway
• external DNS name

You can set address and port default values to make default deployment simple and configure these options if changes are required.
Default values:

• address = trillian-logserver.svc
• port = 8091

[osmman]

I think that you can skip helm chart for testing it and use only Operator. Trillian and Rekor should be possible to install separately via Operator CRD.

Trillain in trillian-system namespace

apiVersion: rhtas.redhat.com/v1alpha1
kind: Trillian
metadata:
  name: example
  namespace: trillian-system
spec:
  database:
    create: true

Rekor in rekor-system namespace

apiVersion: rhtas.redhat.com/v1alpha1
kind: Rekor
metadata:
  name: example
  namespace: rekor-system
spec:
  trillain:
    address: trillain-server.trillain-system.svc

[tommyd450]

/retest

[openshift-ci]

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