Add aarch64-apple to CI (#236)

Author: odow

.github/workflows/ci.yml

@@ -23,6 +23,10 @@ jobs:
           - version: '1.6'
             os: ubuntu-latest
             arch: x86
+          # Test against Apple M-series
+          - version: '1'
+            os: macos-14
+            arch: aarch64
     steps:
       - uses: actions/checkout@v4
       - uses: julia-actions/setup-julia@v2