Add support for configuring keybindings for TUI

[thenonameguy]

The current keybinding is somewhat cumbersome on Fn Lock laptop keyboards (causing airplane mode to be hit instead Start 😄)
It would be nice if the process-compose.yml had some optional top-level action->keybind map that could override the current default bindings.

[F1bonacc1]

Hi @thenonameguy

Good suggestion, I planned some refactoring in that area in any case :)
However, I think process-compose.yml is not the correct place for personalization, since you might want to share your process-compose,yml with other developers.
What do you think about adding a .compose customization file to user's $HOME?

[thenonameguy]

If anything it should be $XDG_CONFIG_HOME , but I much prefer explicit CLI flags so I can decide where I want to host it/template it with an env var.

I would argue that having everything in a process-compose.yml is preferable so that the complete behavior of the runtime is described by it, without anything implicit polluting from the user environment. I guess I'm a purist :)

Alternatively, I'm sometimes longing for docker-compose's deep-merge behavior of yml files:
https://docs.docker.com/compose/reference/#specifying-multiple-compose-files

With this you could solve the per-user keybind problem like:

process-compose -f process-compose.yml -f process-compose.$USER.yml

While also solving the pretty obvious usual BE/FE service split:

## backenders run
process-compose -f process-compose.be.yml
## frontenders run with fe depending on services defined in be
process-compose -f process-compose.be.yml -f process-compose.fe.yml

[F1bonacc1]

Hi @thenonameguy

v0.24.0
Should prevent the airplane mode once and for all 😃

BTW it would be great if you could share your new configuration.