Spotter-VM/vm/etc/apk/repositories

http://dl-cdn.alpinelinux.org/alpine/v3.15/main
http://dl-cdn.alpinelinux.org/alpine/v3.15/community
@spotter https://repo.spotter.cz/alpine/v3.15/apk
Bump Alpine VM to 3.15 2021-12-20 14:12:16 +01:00			`http://dl-cdn.alpinelinux.org/alpine/v3.15/main`
			`http://dl-cdn.alpinelinux.org/alpine/v3.15/community`
			`@spotter https://repo.spotter.cz/alpine/v3.15/apk`