add M1 mac CI

.github/workflows/mac.yml

@@ -0,0 +1,39 @@
+name: M1 Mac
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  ci-mac:
+    runs-on: macos-14
+    steps:
+    - name: install clang
+      shell: bash
+      run: sudo brew install llvm@17 -y
+    - uses: actions/checkout@v4
+      with:
+        submodules: recursive
+    - uses: actions/cache@v4
+      with:
+        path: images
+        key: key
+    - id: cached
+      uses: andstor/file-existence-action@v3
+      with:
+        files: images
+    - name: get benchmark suite
+      if: steps.cached.outputs.files_exists == 'false'
+      shell: bash
+      run: curl https://qoiformat.org/benchmark/qoi_benchmark_suite.tar | tar x
+    - name: build
+      shell: bash
+      run: CXX=$(brew --prefix llvm@17)/bin/clang++ make -j
+    - name: run
+      shell: bash
+      run: bin/qoibench 1 images --noreference --nowarmup
+    - name: test
+      shell: bash
+      run: bin/test