chore(safari): setup safari build and first automation

[lutangar]

This is a first draft, I still need to figure out the best way to ssh to this machine to trigger macOS and iOS build from our current/future CI.

The xcrun safari-web-extension-converter [...] command override every files in target directory including the .git folder... It means I cant first clone the repo and the run the file generation, so I must figure out a git strategy that would preserve other files added to the safari repository (for example a README or a Github workflow, etc...)