style(Dockerfile): Squash glide RUN commands into one layer

Author: Herman Junge

rootfs/Dockerfile

@@ -5,13 +5,10 @@ ENV GLIDE_HOME=/root
 
 WORKDIR /tmp
 
-RUN wget https://github.com/Masterminds/glide/releases/download/0.7.2/glide-0.7.2-linux-amd64.tar.gz
-
-RUN tar xvfz glide-0.7.2-linux-amd64.tar.gz
-
-RUN mv linux-amd64/glide /usr/local/bin/
-
-RUN rm -rf linux-amd64 glide-0.7.2-linux-amd64.tar.gz
+RUN wget https://github.com/Masterminds/glide/releases/download/0.7.2/glide-0.7.2-linux-amd64.tar.gz && \
+    tar xvfz glide-0.7.2-linux-amd64.tar.gz && \
+    mv linux-amd64/glide /usr/local/bin/ && \
+    rm -rf linux-amd64 glide-0.7.2-linux-amd64.tar.gz
 
 WORKDIR /go