lock file missing

[MarkoMin]

To reproduce:

rebar3 new lib abc
cd abc
rebar3 ct

rebar.lock is missing even tho compile is a dependency of ct and it is executed before running tests. If you explicitly run rebar3 compile then lock file is created. I think that lock file should be created in both scenarios.

Lock file is created when running other commands that run in the default profile so probably test profile (ct) is the problem here.

Open to make a contribution.