[FEATURE] - Support folder level file access for Linux

[alefragnani]

I'm aware that MacOS shares a lot of internals from Unix/Linux/BSD and yes, a lot of shell commands should work exactly the same. But I don't have to one, so I can't test it.

PR #60 added folder level support for MacOS, so I need someone with a Linux available, to validate / test it on it.

You can build the extension and remove these when clauses, so the command should be available in Linux as well

vscode-read-only-indicator/package.json

Line 99 in 4c606bd

"when": "isMac || isWindows"

vscode-read-only-indicator/package.json

Line 103 in 4c606bd

"when": "isMac || isWindows"

Thank you