Allow templating git-sync repo url

[kimminw00]

I would like to propose allowing template values to git-sync repo url.

Why is it needed?
Let's assume that we're providing airflow service to multiple teams.
By creating git-sync repo urls using {{ .Release.Namespace }} or {{ .Release.Name }},
there is no need to create multiple values ​​files to store different hostnames ​​for each team.

Usage

dags:
  gitSync:
    enabled: true

    # git repo clone url (can be templated)
    repo: 'https://github.com/{{ .Release.Namespace }}/airflow-dags.git'

[jedcunningham]

@kimminw00, did you intend to close this?

[kimminw00]

@kimminw00, did you intend to close this?

I found a problem with my code.
So I will reopen it again after editing the code.