[BUG] Custom `JULIA_DEPOT_PATH` not being respected

[Miles Cranmer]

Hey @Roger-luo,

Great package, I am really enjoying it. I'm using it for the CLI in AirspeedVelocity.jl and it has been great.

Describe the bug
When you have set a custom JULIA_DEPOT_PATH, running comonicon_install() does not respect it, and will install to ~/.julia/bin. This even happens if ~/.julia does not exist prior to running this command.

Version of the package:
v1.0.4

To Reproduce
Steps to reproduce the behavior:

1. In a virtual container, install Julia at a path other than $HOME. Set JULIA_DEPOT_PATH to point to that custom directory.
2. Install and build AirspeedVelocity.

You will see the executables have been saved at ~/.julia/bin/*, rather than ${JULIA_DEPOT_PATH}/bin/*, where they should be installed.

Thanks for any help.
Best,
Miles

[Xiu-zhe (Roger) Luo]

changing this default value to get(ENV, "JULIA_DEPOT_PATH", ".julia") should fix it