Add Homebrew system check test (#2736)

Following #2735 adds a system check that uses Homebrew. I think we were
never were actually using Homebrew's Python in the past, we were mislead
or something changed in the runners recently that broke it.

.github/workflows/ci.yml

@@ -469,6 +469,30 @@ jobs:
       - name: "Validate global Python install"
         run: python3 scripts/check_system_python.py --uv ./uv --externally-managed
 
+  system-test-macos-aarch64-homebrew:
+    needs: build-binary-macos-aarch64
+    name: "check system | homebrew python on macos aarch64"
+    runs-on: macos-14
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: "Install Python"
+        run: brew install python3
+
+      - name: "Download binary"
+        uses: actions/download-artifact@v4
+        with:
+          name: uv-macos-aarch64-${{ github.sha }}
+
+      - name: "Prepare binary"
+        run: chmod +x ./uv
+
+      - name: "Print Python path"
+        run: echo $(which python3)
+
+      - name: "Validate global Python install"
+        run: python3 scripts/check_system_python.py --uv ./uv --externally-managed
+
   system-test-macos-x86_64:
     needs: build-binary-macos-x86_64
     name: "check system | python on macos x86_64"