See individual commits. Signed-off-by: Stefan Hansson newbyte@postmarketos.org

The previous effort did not work as this script does nothing if not called with the "poweroff" argument. To remedy this use a short script that simply calls...

If a package cannot be found by the given name and it is a valid path, assume that the user is trying to install a local apk file....

While ideally everyone would be running the latest pmbootstrap version, in practice people don't always update right away. And even if they want to, their distribution may not...