ci: Add minimal versions check.
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This will check if our lower bounds for dependencies are valid.
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This is a port of PySequoia's check that I mentioned on a meeting.
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There are several open questions you can help me answer:
- Which projects should be tested? Currently it's only
sequoia-openpgp
. - Which crypto backends should be tested? I think we can check all since it should have fairly low resource usage and this way we test all combinations of all crates.
- Which projects should be tested? Currently it's only