Added Dockerfile-dev and updated build.sh

Build.sh is used for multi-architecture building of docker images.

docker/Dockerfile-dev

@@ -0,0 +1,50 @@
+FROM python:3.8-slim as aprsd
+
+# Dockerfile for building a container during aprsd development.
+ARG BRANCH
+ARG UID
+ARG GID
+
+ENV APRS_USER=aprs
+ENV HOME=/home/aprs
+ENV APRSD=http://github.com/craigerl/aprsd.git
+ENV APRSD_BRANCH=${BRANCH:-master}
+ENV VIRTUAL_ENV=$HOME/.venv3
+ENV UID=${UID:-1000}
+ENV GID=${GID:-1000}
+
+ENV INSTALL=$HOME/install
+RUN apt update
+RUN apt install -y git build-essential
+RUN apt install -y libffi-dev python3-dev libssl-dev
+RUN apt install -y bash fortune
+
+RUN addgroup --gid 1001 $APRS_USER
+RUN useradd -m -u $UID -g $APRS_USER $APRS_USER
+
+ENV LC_ALL=C.UTF-8
+ENV LANG=C.UTF-8
+
+USER $APRS_USER
+RUN pip3 install wheel
+RUN python3 -m venv $VIRTUAL_ENV
+ENV PATH="$VIRTUAL_ENV/bin:$PATH"
+RUN echo "export PATH=\$PATH:\$HOME/.local/bin" >> $HOME/.bashrc
+VOLUME ["/config", "/plugins"]
+
+WORKDIR $HOME
+RUN mkdir $INSTALL
+RUN git clone -b $APRSD_BRANCH $APRSD $INSTALL/aprsd
+RUN    cd $INSTALL/aprsd && pip3 install .
+RUN which aprsd
+USER root
+RUN mkdir -p /config
+RUN aprsd sample-config > /config/aprsd.yml
+RUN chown -R $APRS_USER:$APRS_USER /config
+
+# override this to run another configuration
+ENV CONF default
+USER $APRS_USER
+
+ADD bin/run.sh $HOME/
+ENTRYPOINT ["/home/aprs/run.sh"]