Add support for uploading and downloading host mar artifact in macOS build workflows

.github/workflows/macos-release-build.yml

@@ -141,6 +141,7 @@ jobs:
           echo "Tarballing DMG"
           set -ex
           mv ./dist/*.dmg ./zen-${{ matrix.arch }}-apple-darwin-dist.dmg
+          mv ./engine/obj-${{ matrix.arch }}-apple-darwin/dist/host/bin/mar ./zen-macos-host-mar
 
       - name: Upload dist dmg
         uses: actions/upload-artifact@v4
@@ -149,6 +150,14 @@ jobs:
           name: zen-${{ matrix.arch }}-apple-darwin-dist.dmg
           path: ./zen-${{ matrix.arch }}-apple-darwin-dist.dmg
 
+      - name: Upload host mar
+        uses: actions/upload-artifact@v4
+        if: matrix.arch == 'x86_64'
+        with:
+          retention-days: 1
+          name: zen-macos-host-mar
+          path: ./zen-macos-host-mar
+
       - name: Upload build artifact (update manifests)
         uses: actions/upload-artifact@v4
         with:

.github/workflows/macos-universal-release-build.yml

@@ -220,12 +220,20 @@ jobs:
             --wait
           xcrun stapler staple "zen.macos-universal.dmg"
 
+      - name: Download host mar
+        uses: actions/download-artifact@v4
+        with:
+          name: zen-macos-host-mar
+
       - name: Package for mar
         env:
           JUST_MAR: true
         run: |
           export SURFER_PLATFORM="darwin"
           export ZEN_RELEASE=1
+          # full path to zen-macos-host-mar
+          export MAR=$(pwd)/zen-macos-host-mar
+          echo "MAR=$MAR"
           pnpm package
           mv ./dist/output.mar ./macos.mar