Including data files in a Distillery release

Questions / Help
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5

How can I access the priv path in dev.exs file? When I do it as below:

"#{Application.app_dir(:app)}/priv/ssl/ca.pem"

I got:

** (Mix.Config.LoadError) could not load config config/dev.exs
    ** (ArgumentError) unknown application: :app
    (elixir) lib/application.ex:428: Application.app_dir/1
    (stdlib) erl_eval.erl:670: :erl_eval.do_apply/6
    (stdlib) erl_eval.erl:269: :erl_eval.expr/5
    (stdlib) eval_bits.erl:81: :eval_bits.eval_field/3
    (stdlib) eval_bits.erl:65: :eval_bits.expr_grp/4
    (stdlib) erl_eval.erl:474: :erl_eval.expr/5
    (stdlib) erl_eval.erl:878: :erl_eval.expr_list/6
    (stdlib) erl_eval.erl:236: :erl_eval.expr/5

I’m setting ssl_opts for Ecto, putting those pem files under priv/ssl, but the application can’t access them after building with Distillery.