TLS setup for workflows require dummy value for sslKey

[fettay]

In order to enable tls certificate, we need to set a dummy value for sslKey (never read except on the following line) and setup the secret.

The if should apply to sslKeySecretName

https://github.com/tryretool/retool-helm/blob/8c3f5d76717e4365e45bfc301265e57001ce45cb/charts/retool/templates/deployment_workflows_worker.yaml#L95C87-L95C88