Update Dockerfile

Author: blinktag

Dockerfile

@@ -363,6 +363,7 @@ RUN pkg \
 RUN install -D protoc-gen-ts /out/usr/bin/protoc-gen-ts
 
 FROM sbtscala/scala-sbt:${SCALA_SBT_IMAGE_VERSION} as protoc_gen_scala
+USER root
 RUN mkdir -p /scala-protobuf
 ARG PROTOC_GEN_SCALA_VERSION
 RUN curl -sSL https://api.github.com/repos/scalapb/ScalaPB/tarball/${PROTOC_GEN_SCALA_VERSION} | tar xz --strip 1 -C /scala-protobuf