Accept immudb service install --config=string

[federico-razzoli]

What would you like to be added or enhanced

Please support the service install command with a user-created configuration file.

Why is this needed

Even if I install as a service, I may still want to change the configuration.

Also, changing certain settings later seems impossible or not very easy.

[federico-razzoli]

I also tried to pass environment variables like this:

IMMUDB_SYNC=1 service install

But it doesn't work neither.