doc(release): Update release template for Docker releases

[teor2345]

Motivation

1. We're releasing Docker Hub binaries now, so we need to add a "publish the release" step
2. The Cargo.lock description is confusing.
3. Semantic versioning is explained on their website, so we don't need a detailed description in the release template.

This is the Docker part of #4954, we still need to do the rc part.

Solution

• Make the release a pre-release until the Docker binaries have been built and tested
• Explain that cargo build needs to be run
• Delete a long description of semantic versioning
• Fix a suggested branch name so it will work with Google Cloud

Review

This is a routine update.

I'll need @gustavovalverde to check the new Docker release steps.

Reviewer Checklist

• Docs make sense

[teor2345]

@Mergifyio update

[mergify]

update

✅ Branch has been successfully updated

[gustavovalverde]

@Mergifyio update

[mergify]

update

❌ Base branch update has failed

merge conflict between base and head
err-code: B3618