cargo publish --dry-run - missing validation e.g. number of keywords

[2ndTaleStudio]

Problem
When running cargo publish --dry-run several validations does not seem to be executed. One example is the usage of too many keywords. While cargo publish --dry-run succeeds with e.g. 9 keywords the actual publishing will fail with the message that too many keywords have been passed.

Steps

1. create a project (eg. cargo new)
2. adjust the keywords in Crago.toml to contain 6 or more entries
3. run cargo publish --dry-run - it will not complain

Possible Solution(s)
crates.io may provide a proper validation endpoint to also run the verifications on the server when running --dry-run without actually publishing the crate

Notes

Output of cargo version:

cargo 1.47.0-nightly (aa68721 2020-07-23)

[ehuss]

Thanks for the report! I think this is a duplicate of #4377, #4300, and #2098, so closing in favor of those.