Maybe use a better arguments library

[mback2k]

Maybe replace the custom handling of arguments and environment variables using the built-in flag and os packages with something like the popular spf13/cobra or spf13/viper packages.

The following existing functionality should still be supported:

• passing DOCKER_ environment variables as parameters
• passing docker-systemd-shim flags as environment variables

Size, CPU and memory footprint should be sensible.