Fix release cloudbuild

[schustmi]

Describe changes

Cloudbuild uses an old docker version which doesn't use build kit by default yet. This version always builds all targets specified inside a Dockerfile, which causes a failure when trying to build the python 3.13 image (The client image builds just fine, but something in the server dependencies messes it up).

This PR simply uses the docker buildx commit to use BuildKit for building those images.

Pre-requisites

Please ensure you have done the following:

• I have read the CONTRIBUTING.md document.
• I have added tests to cover my changes.
• I have based my new branch on develop and the open PR is targeting develop. If your branch wasn't based on develop read Contribution guide on rebasing branch to develop.
• IMPORTANT: I made sure that my changes are reflected properly in the following resources:
  • ZenML Docs
  • Dashboard: Needs to be communicated to the frontend team.
  • Templates: Might need adjustments (that are not reflected in the template tests) in case of non-breaking changes and deprecations.
  • Projects: Depending on the version dependencies, different projects might get affected.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Other (add details above)

[github-actions]

Documentation Link Check Results

❌ Absolute links check failed
There are broken absolute links in the documentation. See workflow logs for details
✅ Relative links check passed
_{Last checked: 2025-10-25 02:57:54 UTC}