Also build for linux/riscv64 on release

[mmoll]

I did a successful build on native hardware.

[greptile-apps]

Greptile Summary

This PR adds linux/riscv64 to the list of target platforms in the docker buildx build command documented in the release procedure, enabling RISC-V 64-bit Docker images to be produced during releases.

• The single-line change appends linux/riscv64 to the comma-separated --platform argument in doc/developer/frr-release-procedure.rst, consistent with how the existing architectures are listed.
• The daily master CI workflow (docker-daily-master.yml) uses a smaller subset of platforms and is not updated here, which is consistent with the pre-existing pattern where the daily build already omits several architectures (e.g., linux/ppc64le, linux/s390x, linux/arm/v6) that the release procedure includes.

Confidence Score: 5/5

Safe to merge — a one-word documentation change that appends a new build target to a shell command example.

The change is a single addition to a comma-separated platform list in a documentation file. There is no runtime code involved, and the author reports a successful native-hardware build for the new target.

No files require special attention.

Important Files Changed

Filename	Overview
doc/developer/frr-release-procedure.rst	Adds linux/riscv64 to the docker buildx platform list in the release procedure build command

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Release Tag frr-X.Y.Z] --> B[docker buildx build --platform ...]
    B --> C[linux/amd64]
    B --> D[linux/arm64]
    B --> E[linux/ppc64le]
    B --> F[linux/s390x]
    B --> G[linux/arm/v7]
    B --> H[linux/arm/v6]
    B --> I[linux/riscv64 NEW]
    C & D & E & F & G & H & I --> J[quay.io/frrouting/frr:X.Y.Z]
    J --> K[git tag docker/X.Y.Z]
    K --> L[git push origin docker/X.Y.Z]

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_{Reviews (1): Last reviewed commit: "Also build for linux/riscv64 on release" | Re-trigger Greptile}

[donaldsharp]

Before we can claim support we need to do some actual work on the backend to ensure that it is working and stays working

[Jafaral]

@Mergifyio backport stable/10.7 stable/10.6

[mergify]

backport stable/10.7 stable/10.6

✅ Backports have been created

Details

• #22341 Also build for linux/riscv64 on release (backport #22256) has been created for branch stable/10.7
• #22342 Also build for linux/riscv64 on release (backport #22256) has been created for branch stable/10.6