Allow ports for server and agents to be set using environment variables

[JorritSalverda]

Would be useful to be able to set the following environment variables to control the ports the docker container uses internally.

GO_SERVER_PORT
GO_SERVER_SSL_PORT

The current containers always use the values in /etc/default/go-server or /etc/default/go-agent. Those files should check if the environment variables aren't set already and then use those.

Or is there an alternative to running /sbin/my_init in order to provide those environment variables yourself?

[arvindsv]

You could try this. As you can see here, the startup script runs a file called /init.sh, if it is in the container. So, you can mount a file of that name and change the port used in /etc/default/go-server. I can't easily change that file to check for the environment variables, since it comes from the app and changing it will affect all existing users.

[JorritSalverda]

The init.sh - although executed - didn't seem to override the settings from /etc/default/go-server. I'm trying to mount a custom file instead of the /etc/default/go-server.