Configuration Precedence

Order (later overrides earlier):

1. Built-in defaults
2. ~/.config/rebar3/rebar.config (global)
3. rebar.config (project)
4. Profile-specific configuration
5. Environment variables
6. Command-line options

Example:

% rebar.config (default):
{erl_opts, [debug_info]}.

% Profile overrides:
{profiles, [{prod, [{erl_opts, [no_debug_info]}]}]}.

% Result with `rebar3 as prod compile`:
{erl_opts, [no_debug_info]}  % prod profile wins