Icinga custom repository synchronisation for Linux

Bash version of Sync-IcingaRepository

Argument list matches powershell command except for the -Latest option which downloads only most recent packages in order to keep the local repo small and reduce download traffic

Sync-IcingaRepository
    -Name 'Icinga Stable Local'
    -Path './var/www'
    -RemotePath 'https://monitoring.example.org/repo'
    -Source 'https://packages.icinga.com/IcingaForWindows/stable/ifw.repo.json';
   [-Latest]

In case custom repository files exist in -Path, they get merged into the final ifw.repo.json. They can be named "*.json" and must contain a .Packages attribute just like the ifw.repo.json.