Injection of configurations outside CLI arguments

[raviqqe]

Problem(s)

• It's cumbersome and difficult to specify CLI arguments in some environments.
  • e.g. CI jobs without Git checkouts
• Defining CLI arguments in plain text is error-prone because of variable expansion in shells.

Solution

• Configuration files
  • ini file implementation is variable in Add support for ini file. #363.
• Environment variables

References

• Add support for ini file. #363