feat(role): add tvheadend (close #31)

[JigSawFr]

Description

Tvheadend is a TV streaming server and digital video recorder.
It supports the following inputs: DVB-C(2), DVB-T(2), DVB-S(2), ATSC, SAT>IP, HDHomeRun, IPTV, UDP, HTTP.
It supports the following outputs: HTTP, HTSP (own protocol), SAT>IP.

• Homepage: https://tvheadend.org/
• Github Repository: https://github.com/tvheadend/tvheadend
• Docker Github Repository: https://github.com/linuxserver/docker-tvheadend
• Documentation: https://tvheadend.org/projects/tvheadend/wiki

How Has This Been Tested?

• App is working as expected. (Container is alive and answering to requests)
• App use a dedicated folder in /opt directory.
• App secured by Authelia SSO authentication system.
• A subdomain is correctly created for the web-ui. (via Cloudflare)
• Custom TimeZone is set to the container and application.
• Custom UID/GID is set to the container to run under Saltbox user.
• Healthcheck is added to the container.
• App use a custom output folder (recordings, conversions, etc.) not in /opt.

[saltydk]

owine and max are the ones to ping for reviews on sandbox :p

[JigSawFr]

owine and max are the ones to ping for reviews on sandbox :p
Mistake sry 🥇