@raiden00pl You're 100% correct, arch.yml is totally not needed in nuttx-apps. I have difficulty keeping nuttx/build.yml and nuttx-apps/build.yml in sync, that's why I simply copied over arch.yml as-is.

I suppose in future we could extend arch.yml with Build Rules that are specific to nuttx-apps?

Wonder if we're proposing to remove nuttx-apps/arch.yml? This means that we need to rewrite the build.yml logic from this:

  # Select the Linux Builds based on PR Arch Label
  Linux-Arch:
    uses: apache/nuttx-apps/.github/workflows/arch.yml@master
    needs: Fetch-Source
    with:
      boards: |
        [
          "arm-01", "other", "risc-v-01", "sim-01", "xtensa-01", ...
        ]

  # Run the selected Linux Builds
  Linux:
    needs: Linux-Arch
    if: ${{ needs.Linux-Arch.outputs.skip_all_builds != '1' }}
    strategy:
      matrix:
        boards: ${{ fromJSON(needs.Linux-Arch.outputs.selected_builds) }}

Back to this:

  Linux:
    needs: Fetch-Source
    strategy:
      matrix:
        boards: [arm-01, arm-02, arm-03, arm-04, arm-05, arm-06, arm-07, arm-08, arm-09, arm-10, arm-11, arm-12, arm-13, other, risc-v-01, risc-v-02, sim-01, sim-02, xtensa-01, xtensa-02]