install and update in one

Author: felliott

Dockerfile

@@ -15,10 +15,11 @@ RUN rm -f /var/cache/apt/archives/*.deb
 RUN rm -f /var/cache/apt/archives/partial/*.deb
 RUN rm -f /var/cache/apt/*.bin
 RUN sh -c true
-RUN apt-get update
+# RUN apt-get update
 
 # mfr dependencies
-RUN apt-get install -y \
+RUN apt-get update \
+    && apt-get install -y \
         git \
         make \
         gcc \