Updates for building containers

This patch updates the Dockerfile for building the official container
image and includes the ability to load external pypi modules as plugins
at container startup.

Dockerfile

@@ -1,18 +1,16 @@
 FROM ubuntu:20.04 as aprsd
 
-
 ENV VERSION=1.0.0
 ENV APRS_USER=aprs
 ENV HOME=/home/aprs
-ENV APRSD=http://github.com/craigerl/aprsd.git
-ENV APRSD_BRANCH="master"
+ENV VIRTUAL_ENV=$HOME/.venv3
 
 ENV INSTALL=$HOME/install
 ENV DEBIAN_FRONTEND=noninteractive
 RUN apt-get -y update
 RUN apt-get install -y wget gnupg git-core
-RUN apt-get install -y apt-utils pkg-config sudo
-RUN apt-get install -y python3 python3-pip python3-virtualenv
+RUN apt-get install -y apt-utils pkg-config sudo vim
+RUN apt-get install -y python3 python3-pip python3-virtualenv python3-venv
 
 # Setup Timezone
 ENV TZ=US/Eastern
@@ -24,17 +22,21 @@ RUN dpkg-reconfigure --frontend noninteractive tzdata
 RUN addgroup --gid 1000 $APRS_USER
 RUN useradd -m -u 1000 -g 1000 -p $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"]
+VOLUME ["/config", "/plugins"]
 
 WORKDIR $HOME
-RUN mkdir $INSTALL
-# install librtlsdr from source
-RUN git clone -b $APRSD_BRANCH $APRSD $INSTALL/aprsd
+RUN pip install aprsd
 USER root
-RUN cd $INSTALL/aprsd && pip3 install .
 RUN aprsd sample-config > /config/aprsd.yml
+RUN chown -R $APRS_USER:$APRS_USER /config
 
 # override this to run another configuration
 ENV CONF default