Alpine to AppImage

Converts Alpine Linux packages to AppImages using Docker, make, witchery-compose, and go-appimage.

Pros

Relatively straightforward
The resulting AppImages should be able to run on glibc-based and on musl libc-based Linux distributions, even if they are older than the distribution on which the binaries were compiled (Alpine edge)
Since the ingredients come from Alpine and use musl libc, they do not rely on the target system's glibc version

AppImages created in this way may introduce some overhead which could be optimized away by hand-crafting the AppImage instead of relying on witchery-compose - however this could be mitigated by removing potentially unneeded files using additional rm commands