Disable timeout for installing packages from apk

There's a timeout in place when running commands, that kills them if they do not print any output for long time. The idea is to catch build failures early, because usually when a build command is silent for such a long time, there's something wrong.

However, this also fails if apk takes more than 5 minutes to download a package, as reported here: https://www.reddit.com/r/postmarketOS/comments/b3g1ug/can_someone_help_me/ej0xv2g/

This is confusing, so let's disable the timeout when downloading packages with apk.