fix some imagebuilder not including variant in the name

[cramt]

Some imagebuilders just dont have the variant in their name for.... reasons (example tplink-archer-c5-v2), took a while to debug but the fix is trivial to just add a baseFileName without the variant to the list of possible names

sorry about the formatting, ill use your formatting config if you want me to

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[astro]

Thank you!

The diff is hard to read, so I would love to have the reformatting in a separate commit, if you think the reformatting makes sense.

[astro]

Even a word-diff isn't helpful here. Did you reformat automatically? Which tool did you use? I could try redoing it myself in a separate commit.

[cramt]

oh sorry i completely forgot about this, the actual change is just this

        baseFileNames = [
          "${imageBuilderPrefix}${target}-${variant}.${uname.system}-${uname.processor}"
          "${imageBuilderPrefix}${target}.${uname.system}-${uname.processor}"
        ];
        possibleFileNames = lib.lists.flatten (builtins.map (extension: builtins.map (baseFileName: "${baseFileName}${extension}") baseFileNames) [".tar.zst" ".tar.xz"]);
        matches = builtins.filter (fileName: builtins.hasAttr fileName variantFiles) possibleFileNames;

[cramt]

yeah might be best to do in a seperate commit due to there also being merge conflicts with this pr