simplify assertion for stable files in a folder

[maxulysse]

PR checklist

Closes #XXX

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[nvnieuwk]

This is awesome!

[maxulysse]

ok, so I'm concerned that taxDB is actually not stable

[maxulysse]

I rescued library as a folder name

[maxulysse]

and taxonomy

[maxulysse]

Please let's not merge this, I'll try to fix this properly within nft-utils.

My endgoal is something like:

    then {
      def unstableNames = ["stable_name_infolder.txt", "stable_name_in_subfolder.txt"]
      def stableFiles = getAllFilesFromChannel(process.out.folder[0][1], ignore: unstableNames)
      def stableNames = getAllFilesFromChannel(process.out.folder[0][1], includeDir: true, include: unstableNames)

      assertAll(
        { assert process.success },
        { assert snapshot(
            stableFiles,
            stableNames
          ).match()
        }
      )
    }

[maxulysse]

Still a WIP, as I need to finish the function in nft-utils for this to work as expected

[jfy133]

Note the 'grep' exampledoesn't work, I'm reverting nf-core/website#3281

[SPPearce]

@maxulysse , do you want to take another look at this now?

[SPPearce]

@maxulysse , is this still useful?

[maxulysse]

Let's ditch that, and I'll work on it again from scratch