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.

build/bin/run.sh

@@ -1,6 +1,21 @@
 #!/usr/bin/env bash
+set -x
 
 export PATH=$PATH:$HOME/.local/bin
+export VIRTUAL_ENV=$HOME/.venv3
+source $VIRTUAL_ENV/bin/activate
+
+if [ ! -z "${APRS_PLUGINS}" ]; then
+    OLDIFS=$IFS
+    IFS=','
+    echo "Installing pypi plugins '$APRS_PLUGINS'";
+    for plugin in ${APRS_PLUGINS}; do
+        IFS=$OLDIFS
+        # call your procedure/other scripts here below
+        echo "Installing '$plugin'"
+        pip3 install $plugin
+    done
+fi
 
 # check to see if there is a config file
 APRSD_CONFIG="/config/aprsd.yml"
@@ -8,5 +23,4 @@ if [ ! -e "$APRSD_CONFIG" ]; then
     echo "'$APRSD_CONFIG' File does not exist. Creating."
     aprsd sample-config > $APRSD_CONFIG
 fi
-
-aprsd server -c $APRSD_CONFIG
+$VIRTUAL_ENV/bin/aprsd server -c $APRSD_CONFIG