We are (hopefully) in the process of creating ARM32 Alpine image. This puts us in a position where we will have support for the complete architecture matrix that we support (x64, ARM64, ARM32). That means that we have the option of creating a manifest tag for Alpine. We have that for Debian but haven't for Alpine.

Today, we have:

• 5.0-alpine
• 5.0-alpine-arm64v8

Going forward, we could move to the following (including for Ubuntu and Debian):

• 5.0-alpine (manifest tag)
• 5.0-alpine-amd64
• 5.0-alpine-arm64v8
• 5.0-alpine-arm32v7

Our non-manifest tags have always offered x64 tags as special (no arch specified). This approach would move to a new model:

• Manifest tags have no arch in them and support all arches.
• Concrete tags are fully specified, including arches.

This would be very nice for using .NET container images on Apple Silicon. It's the first mainline developer scenario for ARM64.

Related: dotnet/runtime#2021