Allow docker registry to override fully-qualified container images

[bentsherman]

Close #6150

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[pditommaso]

What's the rationale having a separate list of registries? I'm more inclined having this as a flag and use it along with docker.registry when specified to override fully qualified container names, that's the core requirement.

[bentsherman]

A simple flag would be nice but I'm not sure that you could reliably separate the registry part from the container name part without a list of known registries

However, we could just have a flag that fails the run if any fully-qualified container is specified, instead of trying to override. This is because their main requirement is ensuring that Nextflow doesn't try to use any containers outside of docker.registry

[pditommaso]

I think it would be better to not overload too much the settings for the container registry, and just provide a flag to extend the use of docker.registry to the case of fully qualified container names.

I've provided an implementation in this PR #6205.

[christopher-hakkaart]

Suggested change

	: Nextflow will use this list to modify fully-qualified container images to use the registry specified by `docker.registry`.
	: Nextflow will use this list to modify fully-qualified container images and use the registry specified by `docker.registry`.

Please check meaning is retained

[christopher-hakkaart]

Suggested change

	Use `nextflow inspect` to obtain the list of all containers used by a pipeline, from which you can determine the set of registries that need to be overridden.
	To determine the set of registries that need to be overridden, use `nextflow inspect` to obtain the list of all containers used by a pipeline.

[christopher-hakkaart]

Suggested change

	The pipeline will fail if a container image cannot be overridden when using this setting, in order to prevent Nextflow from pulling containers from outside the custom registry.
	To prevent pulling containers from outside the custom registry, Nextflow will fail the pipeline if it cannot override a container image when using this setting.

Please check the meaning is retained.