Support multi-arch builds and arm64 architecture

[Sawthis]

Description

Extend the image builder to support multi-arch builds and include the arm64 architecture alongside the currently supported architectures. This enhancement is essential for catering to GPU-intensive workloads on the Kyma Runtime.

Reasons

1. Industry Standard Compliance: Native ARM binaries are an industry standard, making our product more competitive and interoperable with other systems.
2. Large Enterprise Requirements: This capability is crucial for reaching out to SAP PSLE Large Enterprise Customers who require ARM support.

Acceptance Criteria

• Evaluate Kaniko and other solutions, like Docker, for multi-platform builds. Determine which is the best fit for implementation in the image builder hosted on Azure DevOps.
• Implement multi-arch build support in the image builder.
• Ensure the image builder can create images for the arm64 architecture in addition to existing architectures.
• Verify that the image syncer supports multi-platform images.

Attachments

• Kyma Issue #18770

[Sawthis]

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