Why is CGo disabled? AFAIK this package doesn't use CGo, so it
should not need to be disabled. Similarly with -a, perhaps that is
necessary in a container?
Also, can GOOS be omitted? I feel like letting Go determine the OS
automatically should work fine here, given we specify Alpine Linux.
Any chance "app" could be changed? If we drop -o, it should default
to "tis-redirector", which I feel would make more sense if someone
were to run `ps' inside the container.
I don't know if people do that though. I imagine not very often.
Still, I like for things to be as understandable as possible.