Example Go Template Syntax - Conditional If-Else, env, printf function

This is an example of Go template syntax, what are doing here:

• Create $domain variable with an empty value.

• Create $ns variable with a value that comes from NAMESPACE environment variable. So, we need to fill that first to make the logic work. E.g export NAMESPACE=staging.

• Logic / conditional if-else for checking the equality ( eq ) of $ns.

• printf function for string concatenation.

{{ $domain := "" }}
{{ $ns := env "NAMESPACE" -}}
{{ if eq $ns "staging" -}}
{{ $domain = printf ".%s.svc.cluster.local:2200" $ns }}
{{ else -}}
{{ $domain = printf ".%s.svc.cluster.local:2200" $ns }}
{{ end }}