Refactor command-running to run oneshots after startup #23
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This refactors the command-running utilities to take the fx.Options as
variadic arguments, so that fxapps.OneShot can add its own fx.Option.
It uses a bit of reflection to convince Fx to gather the arguments to a
function without actually calling that function immediately, allowing
the oneShot function to run after
app.Start
has finished, when we'resure that all components have started. This works around the startup
ordering bug in uber-go/fx#918.