diff --git a/Dockerfile b/Dockerfile
index b0bc530..ba0ecd1 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,10 +3,9 @@ RUN apt-get update
 RUN apt-get install openssh-server sudo jq curl -y && \
 apt-get clean && \
 rm -rf /var/lib/{apt,dpkg,cache,log}/
-COPY . /app
-WORKDIR /app
 RUN useradd -rm -d /home/ubuntu -s /bin/bash -g root -G sudo -u 1000 m -o
-RUN sudo chown -R m:sudo *
+WORKDIR /app
+COPY --chown=m:sudo . /app
 # replace for linux-compatible line endings
 RUN sed -i 's/\r$//' /app/StartServer.sh
 USER m