De-hardcode security keys

[LordTermor]

There are some places in code where hardcoded security keys are used.

bxt/daemon/presentation/web-filters/JwtFilter.cpp

Line 35 in 93e2109

.allow_algorithm(jwt::algorithm::hs256 {"secret"})

bxt/daemon/presentation/cli-controllers/DeploymentController.h

Line 49 in 93e2109

std::string m_key = "KEY0";

bxt/daemon/presentation/web-controllers/AuthController.cpp

Line 45 in 93e2109

jwt::algorithm::hs256 {"secret"});

bxt/daemon/presentation/web-controllers/AuthController.cpp

Line 68 in 93e2109

.allow_algorithm(jwt::algorithm::hs256 {"secret"})