White space in CI

[Simon Peyton Jones]

 Devs

As you'll see from this pipeline record
https://gitlab.haskell.org/ghc/ghc/-/merge_requests/7105/pipelines

CI consistently fails once a single commit has trailing whitespace, even if
it is fixed in a subsequent commit

   - dce2054d
   <https://gitlab.haskell.org/ghc/ghc/-/commit/dce2054d44ea60bdde6409050284fbbcc227457a>
   introduced trailing whitespace
   - 6411223c
   <https://gitlab.haskell.org/ghc/ghc/-/commit/6411223cd3977c92d01b09b55a455d8d86adde1d>
   removed it again.
   - but all subsequent pipelines fail

This came as a big surprise.  It doesn't make sense to lint each individual
commit.  Let's just lint the final version!  (I will squash them in due
course, but I didn't want to lose my work-in-progress history.)

Simon
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