update dockerfile.m to include essential packages

Author: GREENRAT-K405

Dockerfile.m

@@ -1,3 +1,8 @@
 FROM mtmiller/octave 
+
+USER root
+RUN apt-get update && apt-get install -y --no-install-recommends octave-control octave-signal && rm -rf /var/lib/apt/lists/*
+RUN echo "pkg load signal;" >> /etc/octave.conf && echo "pkg load control;" >> /etc/octave.conf
+
 COPY . /src
 WORKDIR /src