cpp dockerfile downgrade

Signed-off-by: Arnav Gupta <arnav@codingblocks.com>

Author: championswimmer

containers/cpp/Dockerfile

@@ -1,6 +1,6 @@
-FROM alpine:3.8
+FROM alpine:3.6
 
-RUN apk add --no-cache g++=6.4.0-r8 musl-dev bash
+RUN "apk add --no-cache g++=6.3.0-r4 musl-dev bash"
 COPY ./compile.sh /bin/compile.sh
 COPY ./run.sh /bin/run.sh
 RUN chmod 777 /bin/compile.sh; \