Add arm64 platform support to Docker builds

[suin]

1. Does this PR affect any open issues?(Y/N) and add issue references (e.g. "fix #123", "re #123".):

• Y

re #63

2. What is the scope of this PR (e.g. component or file name):

.github/workflows/release.yaml

3. Provide a description of the PR(e.g. more details, effects, motivations or doc link):

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Other

This PR adds ARM64 support to the Docker images by modifying the GitHub Actions workflow to build multi-architecture images. This enhancement enables users to run the project natively on ARM64 systems like Apple Silicon Macs and AWS Graviton instances.

Changes:

• Updated .github/workflows/release.yaml to build images for both AMD64 and ARM64
• No changes to Dockerfile or Go code required as they already support cross-compilation

Implementation:

# Before
platforms: linux/amd64

# After
platforms: linux/amd64,linux/arm64

4. Are there any breaking changes?(Y/N) and describe the breaking changes(e.g. more details, motivations or doc link):

• N

5. Are there test cases for these changes?(Y/N) select and add more details, references or doc links:

• Unit test
• Integration test
• Benchmark (add benchmark stats below)
• Manual test (add detailed scripts or steps below)
• Other

Manual testing performed:

1. Build and Registry Testing:

   • Successfully built both AMD64 and ARM64 images using GitHub Actions in fork repository
   • Successfully pushed multi-arch images to Quay.io registry

2. Kubernetes Environment Testing:

   • Platform: AWS EKS cluster with ARM64 EC2 nodes
   • Deployment: Successfully deployed the webhook on ARM64 nodes
   • Functionality: Created KCLRun objects and verified that mutations were correctly applied

This comprehensive testing confirms that the ARM64 build works correctly in a production-like environment, maintaining all expected functionality of the webhook.

[suin]

I've submitted this PR to demonstrate one possible approach to the ARM64 support discussed in #64. If you have a different direction in mind or see any concerns with this approach, please feel free to let me know. I'm happy to adjust or reconsider the implementation based on your feedback.

[zong-zhe]

LGTM ! 😄 Thank you for your contributions and welcome to be a KCL contributor ! cc @He1pa

[He1pa]

nice work! lgtm

[suin]

Thank you for the review and merge! Happy to contribute to the KCL project. 🙂