feat(release): create Docker hub binaries when tagging

[gustavovalverde]

Motivation

We'd like to have binaries published in Docker Hub for easier pulling, as people is more used to use the pull <org>/<image>:<tag> approach when pulling Docker images, instead of long URLs which could also change.

Designs

Publish binaries to Docker Hub when we're making a new release.

Solution

• Create a new workflow for binary releases
• Just build this binaries when a release is created (not a pre-release)
• This binaries are meant to be push to Docker Hub

Fixes #1963

Review

We might want to be more strict with which tags to release to Docker Hub.

Reviewer Checklist

• Code implements Specs and Designs
• Tests for Expected Behavior

Follow Up Work

Update #4917 with this information (?)

[teor2345]

This looks really good, thanks for pulling it together.

But I'm wondering if triggering releases using a tag filter is confusing or error-prone.

We've never used tags for development - we just seem to use branches.
But if we ever do, it would be a bit hard for developers to remember to start tags with letters other than v. (And if they forget, their tag gets published as an official release, and everyone using zebrad:latest automatically gets it.)

Can we use the release events instead?
https://docs.github.com/en/developers/webhooks-and-events/webhooks/webhook-events-and-payloads#webhook-payload-object-41

[gustavovalverde]

Seems like this needs further testing as this condition is not working as expected . I'm pulling it back to draft in the meanwhile as I have to find a better way to make this work as expected https://github.com/ZcashFoundation/zebra/pull/5138/files#diff-5b40193e09025fd041de92d38c976d0b469e3ee85bef45a71d05d8b5078b1ee8R111

[teor2345]

Thanks for these changes!

I just went through the comments and made them match what I think is happening. Feel free to edit them or reject them.

I'm happy for anyone to re-approve this PR.

[gustavovalverde]

There were a bunch of edge cases, but this is finally ready!

[teor2345]

I just want to check the tags before we merge.

[gustavovalverde]

Delete https://github.com/ZcashFoundation/zebra/releases/tag/v1.0.0 when this is approved

[teor2345]

We might want to format all the version numbers in our tags the same way.

[teor2345]

Thanks for the changes, looks good!