Add publishing integrity check after releasing

[ernestognw]

Description

Add an integrity check to ensure contracts were packed exactly as they're in the repository.

Checklist

• Test release on a dummy package

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Latest commit: 0583798

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[frangio]

Looks good. Minor style comments:

[ernestognw]

Action lint is failing because the download-path is not declared in the artifact/download action .yaml.
The fix is already merged but we might want to wait until it's released. Another option is to ignore the error somehow but I don't like the idea.

What do you think? @frangio

[frangio]

We can use the latest commit even if it's not tagged yet: actions/download-artifact@e9ef242655d12993efdcda9058dee2db83a2cb9b.