BLD/CI: switch to uv_build, add windows and macOS CI

.github/workflows/tests.yml

@@ -5,15 +5,44 @@ on: [ push, pull_request ]
 jobs:
   xsref_tests:
     name: xsref table consistency tests
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.runs-on }}
+    strategy:
+      fail-fast: false
+      matrix:
+        runs-on: [ubuntu-latest, macos-latest]
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
 
       - uses: prefix-dev/setup-pixi@92815284c57faa15cd896c4d5cfb2d59f32dc43d # v0.8.3
         with:
-          pixi-version: v0.70.1
+          pixi-version: v0.76.1
           cache: true
           environments: tests
 
       - name: Run tests
         run: pixi run tests
+
+  pixi_packages:
+    name: Build Pixi packages
+    runs-on: ${{ matrix.runs-on }}
+    strategy:
+      fail-fast: false
+      matrix:
+        runs-on: [ubuntu-latest, macos-latest, windows-latest]
+    steps:
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+
+      - name: Set caches to D drive (Windows)
+        if: runner.os == 'Windows'
+        shell: pwsh
+        run: |
+          'UV_CACHE_DIR=D:\uv_cache' >> $env:GITHUB_ENV
+          'RATTLER_CACHE_DIR=D:\rattler_cache' >> $env:GITHUB_ENV
+
+      - uses: prefix-dev/setup-pixi@92815284c57faa15cd896c4d5cfb2d59f32dc43d # v0.8.3
+        with:
+          pixi-version: v0.76.1
+          run-install: false
+
+      - name: Publish Pixi package
+        run: pixi publish