When we fail to get the info for the binary names of `radicle-node` and
`git-remote-rad`, we still mention the binary name which is usually a part of
their output.
A `HashMap` does not guarantee a consistent iteration order. It is
desirable that all environment variables are printed in a consistent
order.
Use a `BTreeMap` which guarantees a consistent iteration order.
Lorenz Leutgeb
Fintan Halpenny