Add AWS megatest GHA

[FriederikeHanssen]

This adds the GHA for aws megatests. It was tested here https://github.com/ggabernet/nf-core-sarek/pull/3
Since the access tokens are not widely shared, I can not run a complete test on my account. However, if we set them up for this repo it should work.

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[maxulysse]

Looks Amazingly Good To Me

[ggabernet]

The aws test workflow is called awstest.yml. Do you think it would be possible to just add your edits to that one?

[FriederikeHanssen]

The aws test workflow is called awstest.yml. Do you think it would be possible to just add your edits to that one?

Yes of course. Dev branch of my fork wasn't up-to-date, so I oversaw the already existing file. It is done

[ggabernet]

Two small suggestions, that will directly add -with-tower as well :)