fix dockerfile
@ -3,7 +3,7 @@ FROM ubuntu:rolling
COPY . .
RUN apt-get update \
&& apt-get install -y software-properties-common python-software-properties \
&& apt-get install -y software-properties-common \
&& add-apt-repository -y ppa:ethereum/ethereum \
&& apt-get update \
&& apt-get install -y solc \