For local development add the repo using mix:

wget -q http://hex.gpr.technocs.ru/local_hex_public.pem
mix hex.repo add local_hex http://hex.gpr.technocs.ru --public-key local_hex_public.pem
rm -f local_hex_public.pem

To verify that mix is aware of the new repository:

mix hex.repo list

Name URL Public key Auth key
local_hex http://hex.gpr.technocs.ru SHA256:w6Y0FECtU/UdA//tTMJ63NNc1Glj79WBhKiDWZM33iU
hexpm https://repo.hex.pm SHA256:O1LOYhHFW4kcrblKAxROaDEzLD8bn1seWbe5tq8TRskh

Point dependencies to the internal repository from your mix.exs:

{:jason, "~> 1.0"},
{:your_library, "~> 0.8.3", repo: local_hex},

Internal Libraries