fix: How to use service_account json?

[mafreud]

In debug env, I place service_accoun.json at the local root directory. But, when in a production environment, where should I put it?

[mafreud]

Currently, openci_runner reads service_account.json from the local root directory. But when using openci_runner as CLI, it's impossible to read it. So, I have to develop a way to load service_account.json from the CLI interface, like

openci_runner android_run -s /path/to/service_account.json