Add Ctrl+S/CMD+S keyboard shortcuts to save .env file

[mityax]

What problem will this feature address?

It's a bit confusing that these shortcuts are not supported when editing the environment but are supported when editing a compose.

Describe the solution you'd like

Implement the shortcuts – same as was done in #1737, I guess

Will you send a PR to implement it?

No

[IAmRiteshKoushik]

This seems like an easy enough fix ? Can I work on this if it's planned for this release ? @Siumauricio