Make server githubApp.certSecretName configurable

[andrew-farries]

Description

Allow the server config value githubApp.certSecretName to be configured via the installer config.

Related Issue(s)

Follow up to #9297.

Part of the #9097 epic.

How to test

Add an experimental section to the bottom of an installer config file like this:

experimental:
  webapp:
    server:
      githubApp:
        appId: 123
        authProviderId: 'someAuthProviderId'
        baseUrl: 'someBaseUrl'
        certPath: 'someCertpath'
        enabled: true
        logLevel: 'someLogLevel'
        marketplaceName: 'someMarketPlacename'
        webhookSecret: 'somewebhookSecret'
        certSecretName: 'someCertSecretName'

and invoke this installer:

installer render --config /path/to/config --use-experimental-config

In the rendered installer output the certSecretName will be set in the server-config Configmap (config.json key).

Release Notes

NONE

Documentation

No changes needed.

[roboquat]

@andrew-farries: Adding the "do-not-merge/release-note-label-needed" label because no release-note block was detected, please follow our release note process to remove it.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[easyCZ]

LGTM. Adding hold to merge when you're ready.

/hold

[geropl]

small nit: CertSecretName (upper case Name) would fit with JSON and other Names

[geropl]

LGTM - keep hold for this nit.

[andrew-farries]

/unhold

[geropl]

👍 Thx for adjusting!