config: Support Arguments on root module

[jkroepke]

Request

Grafana Agent have arguments block which only exists on module.

I had the idea to support arguments on the root context, too. arguments can be defined via CLI argument, e.g. --set arguments=value.

Use case

It would be an alternative in addition to environment variables parameterize static configuration.

[tpaschalis]

That is an interesting idea to explore, and an alternative to the debug.variables component idea we'd discussed in the past, with a tradeoff between dynamic behavior and more understandable configuration.

I'm not 100% sold on it yet, but it can be discussed as part of grafana/agent#5547.

[jkroepke]

Origin: https://docs.docker.com/engine/reference/commandline/buildx_bake/#set

I found that pattern on the docker buildx plugin. At the moment, I have to use environment variables which is also fine.

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