What is the list of supported architectures?

Is there a list of supported architectures? “arch” and “architectures” has no results in doc search.
This example https://docs.drone.io/pipeline/docker/examples/languages/c/ shows arch: amd64 . But that’s just an example snippet. I want a list of supported arch values. Does Drone support 64 bits only? What sub-architecture(s) are supported?

You can install the Docker pipeline runner on any architecture supported by Docker. We provide official images for linux/amd64, linux/arm, linux/arm64 and windows/amd64 that you can download and install:
https://docs.drone.io/runner/docker/installation/

If your target architecture is not supported, you may consider installing the exec pipeline runner, which executes pipelines directly on the host (no Docker involved). It supports a variety of operating systems and platforms:

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