fix: scala arm64 "failed to exec spawn helper"

Dockerfile

@@ -370,7 +370,8 @@ WORKDIR /scala-protobuf
 RUN gu install native-image
 # Make sbt use the version of native-image installed by gu instead of downloading a separate version
 ARG NATIVE_IMAGE_INSTALLED=true
-# RUN chmod +x $JAVA_HOME/lib/jspawnhelper
+# Fix "Failed to exec spawn helper" error in arm64 emulator build
+ARG JAVA_OPTS="-Djdk.lang.Process.launchMechanism=vfork"
 RUN ./make_reflect_config.sh
 RUN sbt protocGenScalaNativeImage/nativeImage
 RUN install -D /scala-protobuf/target/protoc-gen-scala /out/usr/bin/protoc-gen-scala