split Mac build into separate x64, arm64, and universal2 archives

Author: anthrotype

.github/workflows/ci.yml

@@ -22,11 +22,30 @@ jobs:
       with:
         python-version: 3.9
     - name: Build library
-      run: ./build.sh
+      run: |
+        # Build universal2 (creates x64, arm64, and universal2 binaries)
+        ./build.sh
+
+        # Create separate archives for each architecture with proper directory structure
+        mkdir -p dist/libskia-mac-x64 dist/libskia-mac-arm64 dist/libskia-mac-universal2
+        cp build/x64/libskia.a dist/libskia-mac-x64/
+        cp build/arm64/libskia.a dist/libskia-mac-arm64/
+        cp build/libskia.a dist/libskia-mac-universal2/
+        (cd dist && zip -r libskia-mac-x64.zip libskia-mac-x64)
+        (cd dist && zip -r libskia-mac-arm64.zip libskia-mac-arm64)
+        (cd dist && zip -r libskia-mac-universal2.zip libskia-mac-universal2)
     - uses: actions/upload-artifact@v4
       with:
-        name: libskia-mac
-        path: dist/*.zip
+        name: libskia-mac-x64
+        path: dist/libskia-mac-x64.zip
+    - uses: actions/upload-artifact@v4
+      with:
+        name: libskia-mac-arm64
+        path: dist/libskia-mac-arm64.zip
+    - uses: actions/upload-artifact@v4
+      with:
+        name: libskia-mac-universal2
+        path: dist/libskia-mac-universal2.zip
   build-linux:
     runs-on: ${{ matrix.os }}
     env: