support for linux

[saaraahfar]

I can't install graphql-background on linux, brew does't support --cask, there is even and old issue which is closed without being resolved

user@user:~$ brew install --cask graphql-playground
Running `brew update --auto-update`...
==> Auto-updated Homebrew!
Updated 1 tap (homebrew/core).

Error: Invalid `--cask` usage: Casks do not work on Linux

user@user:~$ brew install graphql-playground
Warning: No available formula with the name "graphql-playground". Did you mean graphql-cli?
==> Searching for similarly named formulae...
==> Formulae
graphql-cli

To install graphql-cli, run:
  brew install graphql-cli

[tanguySnoeck]

just install the snap or deb package from the release page