make multi-platform

Author: wolfv

.github/workflows/build.yml

@@ -10,12 +10,15 @@ jobs:
       attestations: write
 
     name: Build package
-    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+    runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v4
       - uses: prefix-dev/setup-pixi@v0.8.2
         with:
-          pixi-version: v0.41.1
+          pixi-version: v0.41.4
 
       - name: Build the package with rattler-build
         run: |