27.1-ls19

LinuxServer Changes:

Rebasing to alpine 3.12.
forked-daapd Changes:

• web UI upgraded to v0.6.0: settings page, display more Spotify data
• support for volumeup, volumedown and mutetoggle DACP commands
• support for multiple ALSA devices
• suppress repeated logging of same message to avoid log file bloat
• fix opening too many files due to looping with shairport-sync
• fix for genres with single quotes in name
• fix for incorrect update of time_added metadata
• fix some small memleaks and missing cleanup