Regroup commands in Dockerfile

Dockerfile

@@ -1,6 +1,9 @@
 FROM ubuntu:latest
-LABEL version="1.0" maintainer="John Stucklen <[email protected]>"
+LABEL version="1.1" maintainer="John Stucklen <[email protected]>"
 
+ENV LC_ALL en_US.UTF-8
+ENV LANG en_US.UTF-8
+ENV LANGUAGE en_US:en
 ENV SUBSONIC_UID 1000
 ENV SUBSONIC_GID 1000
 
@@ -11,21 +14,16 @@ RUN apt update \
   && rm -rf /var/lib/apt/lists/*
 
 RUN sed -i -e 's/# en_US.UTF-8 UTF-8/en_US.UTF-8 UTF-8/' /etc/locale.gen && \
-    locale-gen
-ENV LC_ALL en_US.UTF-8 
-ENV LANG en_US.UTF-8  
-ENV LANGUAGE en_US:en 
+    locale-gen && \
+    localedef -i en_US -c -f UTF-8 -A /usr/share/locale/locale.alias en_US.UTF-8
 
-RUN mkdir -p /opt/subsonic \
-  && localedef -i en_US -c -f UTF-8 -A /usr/share/locale/locale.alias en_US.UTF-8
-
-RUN wget --no-check-certificate https://s3-eu-west-1.amazonaws.com/subsonic-public/download/subsonic-6.1.6-standalone.tar.gz \
-  && tar xvzf subsonic-6.1.6-standalone.tar.gz -C /opt/subsonic \
-  && rm -rf subsonic-6.1.6-standalone.tar.gz
+RUN mkdir -p /opt/subsonic && \
+    wget --no-check-certificate https://s3-eu-west-1.amazonaws.com/subsonic-public/download/subsonic-6.1.6-standalone.tar.gz && \
+    tar xvzf subsonic-6.1.6-standalone.tar.gz -C /opt/subsonic && \
+    rm -rf subsonic-6.1.6-standalone.tar.gz
 
 COPY mikmod_stdout /opt/subsonic
 COPY timidity_stdout /opt/subsonic
-
 COPY entrypoint.sh /opt/subsonic/entrypoint.sh
 
 WORKDIR /opt/subsonic