Cherry-pick ci fixes to release/v0.73.x branch #4288
Merged
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Describe your changes
Ports the CI fixes in #4282 & #4286 to the release branch for the current testnet. Doing this so that today's point release for #4284 will include new build artifacts.
Involved some manual conflict-resolution, particularly around RUSTFLAGS, preserving the overrides since we haven't dropped the requirement for the tokio unstable flag in the release branches yet. Made sure to test the latest copy of the release workflow on a private fork.
Checklist before requesting a review
If this code contains consensus-breaking changes, I have added the "consensus-breaking" label. Otherwise, I declare my belief that there are not consensus-breaking changes, for the following reason: