Add a runner for aarch64-linux-gnu (#38)

Author: odow

.github/workflows/ci.yml

@@ -22,6 +22,9 @@ jobs:
          - version: '1'
            os: macos-14
            arch: aarch64
+         - version: '1'
+           os: ubuntu-24.04-arm
+           arch: aarch64
     steps:
       - uses: actions/checkout@v4
       - uses: julia-actions/setup-julia@v1