fixed apt-get update / install in dockerfile for static code validation (#410)

Signed-off-by: Andrey Kononykhin <[email protected]>

Author: andkononykhin

ci/code-validation.dockerfile

@@ -4,8 +4,7 @@ FROM ubuntu:16.04
 ARG uid=1000
 
 # Install environment
-RUN apt-get update -y
-RUN apt-get install -y \ 
+RUN apt-get update -y && apt-get install -y \
 	git \
 	wget \
 	python3.5 \