make cabal-install integration tests hermetic (backport #10205) #10218
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They were using the user's config, which is a problem if they don't have one or if it contains settings that interfere with tests (such as
documentation: True
).I'm not entirely certain of this, but it seems to work here. It's a bit of a hack, though.
Closes: #10187
Template B: This PR does not modify behaviour or interface
E.g. the PR only touches documentation or tests, does refactorings, etc.
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This is an automatic backport of pull request #10205 done by [Mergify](https://mergify.com).