Work around for buildx failures

[felddy]

Cache errors cause build failures.

🗣 Description

See: docker/setup-buildx-action#27

💭 Motivation and Context

Allows builds to succeed.

🧪 Testing

Tested in felddy/weewx project.

📷 Screenshots (if appropriate)

🚥 Types of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (causes existing functionality to change)

✅ Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.