Error building on Linux arm64 runners

[AndrewBarba]

GitHub recently released arm64 runners: https://github.blog/changelog/2025-01-16-linux-arm64-hosted-runners-now-available-for-free-in-public-repositories-public-preview/

setup-swift fails with permission errors: https://github.com/swift-cloud/swift-cloud/actions/runs/12818214529/job/35743189867

name: Test

on:
  push:
    branches: [main]
  pull_request:
    branches: [main]

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

jobs:
  build:
    runs-on: ${{ matrix.os }}

    strategy:
      matrix:
        os: [ubuntu-24.04-arm, macos-latest-xlarge]
        swift: ["6.0"]

    steps:
      - uses: actions/checkout@v4

      - name: Setup Swift
        uses: swift-actions/setup-swift@v2
        with:
          swift-version: ${{ matrix.swift }}

      - uses: actions/cache@v4
        with:
          path: .build
          key: ${{ runner.os }}-spm-${{ matrix.swift }}-${{ hashFiles('**/Package.resolved') }}
          restore-keys: |
            ${{ runner.os }}-spm-${{ matrix.swift }}-

      - run: swift --version

      - run: swift build

      - run: swift test