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This PR builds on #3488 by @danieled-it
I removed the cosign check. As I thought about it, I think there is no threat model under which that extra check is helpful. Cosign checks are useful if the user already has the ockam release public key. If they don't then first fetching the public key and then the binary from the same channel doesn't protect against any additional threats.
Same with shasum checks. If https is doing its job then validating them seems unnecessary.
In this PR I also improved the script with ideas from (MIT licensed)
https://github.com/rust-lang/rustup/blob/master/rustup-init.sh