Formatting and update the CMD in Dockerfile.

Author: alfg

Dockerfile

@@ -162,7 +162,6 @@ ADD static /www/static
 EXPOSE 1935
 EXPOSE 80
 
-CMD /bin/sh -c envsubst "$(env | sed -e 's/=.*//' -e 's/^/\$/g')" < \
-  /etc/nginx/nginx.conf.template > \
-  /etc/nginx/nginx.conf && \
+CMD envsubst "$(env | sed -e 's/=.*//' -e 's/^/\$/g')" < \
+  /etc/nginx/nginx.conf.template > /etc/nginx/nginx.conf && \
   nginx