Extend Image Builder to support multi-arch builds including arm64

[Sawthis]

Description

Currently, our image builder supports a limited set of architectures, excluding arm64. This enhancement aims to extend the image builder to support multi-architecture builds, specifically adding support for the arm64 architecture. This is critical for catering to GPU-intensive workloads on the Kyma Runtime and ensuring broader industry standard compliance.

Reasons

• Industry Standard Compliance: Native arm64 binaries are an industry standard. Adding support for arm64 will make our product more competitive and interoperable with other systems.
• Large Enterprise Requirements: This capability is crucial for SAP PSLE Large Enterprise Customers who require arm64 support.

Acceptance Criteria

1. Evaluate and Select Tools

• Evaluate Kaniko and other solutions such as Docker for multi-platform builds.
• Determine the best tool for implementation in the image builder hosted on Azure DevOps.
• Document the findings and rationale behind the chosen tool.

2. Implement Multi-Arch Build Support

• Extend the image builder to support multi-architecture builds.
• Ensure that the image builder can create images for the arm64 architecture alongside the currently supported architectures.

3. Verify Multi-Platform Image Build and Sync

• Conduct thorough testing to ensure that images for all supported architectures are correctly built and synced.
• Verify that the image syncer fully supports multi-platform images.

Attachments

• Kyma Issue #18770

[Sawthis]

https://github.com/kyma-project/test-infra/blob/main/cmd/image-syncer/README.md#overview