Build Bazel dmg file for release

RELNOTES: None
PiperOrigin-RevId: 294666366
diff --git a/scripts/kokoro/release/build_macos.sh b/scripts/kokoro/release/build_macos.sh
index 6d1e252..6f0a6f3 100755
--- a/scripts/kokoro/release/build_macos.sh
+++ b/scripts/kokoro/release/build_macos.sh
@@ -39,8 +39,10 @@
     --embed_label "${RELEASE_NAME}" \
     --workspace_status_command=scripts/ci/build_status_command.sh \
     src/bazel \
-    scripts/packages/with-jdk/install.sh
+    scripts/packages/with-jdk/install.sh \
+    scripts/packages/dmg/bazel.dmg
 
 mkdir artifacts
 cp "bazel-bin/src/bazel"  "artifacts/bazel-${RELEASE_NAME}-darwin-x86_64"
 cp "bazel-bin/scripts/packages/with-jdk/install.sh" "artifacts/bazel-${RELEASE_NAME}-installer-darwin-x86_64.sh"
+cp "bazel-bin/scripts/packages/dmg/bazel.dmg" "artifacts/bazel-${RELEASE_NAME}-darwin-x86_64-unsigned.dmg"