Provide a way to override platform map keyboards globally.

[hanoii]

Is your feature request related to a problem? Please describe.

I have mac and work a lot inside containers using ddev (incidently, another great go project). And I use lazygit on both the host and inside the container, and I update it regularly on both. I am used to doing alt+backspace to delete a word and this doesn't work on the container because it is using the linux default ctrl+backspace.

Describe the solution you'd like

I thought it might be a good idea to provide a map platform override. For instance I have DDEV_GOOS=darwin inside the container, so if I can configure lazygit with a similar env var or configuration where I can tell it to use darwin which it will be used from the env var would be awesome.

Describe alternatives you've considered

II know I can configure the keybindings but this comes from a ddev add-on (used by several others) on different platforms.

[stefanhaller]

Makes sense. I don't think I want to add a config for this, but an env var sounds fine; see #5671. Please test if this addresses your needs.