`nextflow launch` support launchContainer field

[adamrtalbot]

New feature

The Seqera API supports the launchContainer field, but this is not exposed in the nextflow launch CLI. It's important to be able to control the Nextflow version so it matches your local version.

Use case

If my remote Nextflow uses 25.04 by default but my local version uses 25.10, I may wish to select the launchContainer as myregistry.io/nextflow:25.10.4

Suggested implementation

nextflow launch -launch-container myregistry.io/nextflow:25.10.4

Default is null and ignored in the POST request.

[just-simon-5]

Thank you @adamrtalbot this would be really useful for my use case