diff --git a/docker/Dockerfile.backend b/docker/Dockerfile.backend
index af1a301..7022770 100644
--- a/docker/Dockerfile.backend
+++ b/docker/Dockerfile.backend
@@ -2,14 +2,12 @@ FROM maven:3-jdk-7 AS build
 ENV BUILD_UID=1000
 ENV BUILD=/src
 ENV MAVEN_HOME=/var/maven
-ENV MAVEN_CONFIG=/var/maven/.m2
 RUN mkdir -p $MAVEN_HOME && chown $BUILD_UID $MAVEN_HOME
-RUN mkdir -p $BUILD
-ADD .. $BUILD
-RUN chown -R $BUILD_UID $BUILD
+ADD --chown=$BUILD_UID:$BUILD_UID .. $BUILD
 USER $BUILD_UID
 WORKDIR $BUILD
-RUN --mount=type=cache,target=$MAVEN_HOME/.m2,uid=$BUILD_UID mvn -e -Duser.home=$MAVEN_HOME package
+RUN --mount=type=cache,target=$MAVEN_HOME/.m2,uid=$BUILD_UID \
+	mvn -e -Duser.home=$MAVEN_HOME package
 
 FROM openjdk:7u211-jre-alpine
 RUN <<EOF