Dockerfile for gcc compiler with simple fish prompt and mpi

Dockerfile

FROM nlknguyen/alpine-mpich
FROM gcc

# Update the containers to install fish
RUN apt-get update 
RUN apt-get upgrade -y
RUN apt-get install -y fish vim

# Install PNG Library
RUN wget https://download.savannah.nongnu.org/releases/pngpp/png++-0.2.9.tar.gz
RUN tar -zxf png++-0.2.9.tar.gz -C .
WORKDIR png++-0.2.9
RUN make
RUN make install

# Add user to prevent root executing the mpi processes
RUN useradd -ms /bin/bash mpi
USER mpi
WORKDIR /home/mpi

# Set Working DIR
ENTRYPOINT ["fish"]