Witched to multi-stage building

Dockerfile

@@ -1,25 +1,40 @@
-FROM node:6.10-alpine
+### Alpine Driftnet Builder Image ###
+FROM alpine:3.6 as builder
 
-ENV PROJECT_PATH /driftnet
+# Install the needed dependencies to build driftnet
+RUN apk -U add --no-cache git build-base libpcap-dev
+
+# Download the dldewolf fork of driftnet.  We specifically want this version
+# as it supports PNG files.
+RUN git clone https://github.com/bldewolf/driftnet.git /driftnet
+
+# We will need to make some modifications to the makefile so that we don't attempt
+# to build with GTK.  As we won't have any kind of a GUI to interface to, its quite
+# silly to add all of that complexity.  Once the modifications are complete, we will
+# then build driftnet.
+WORKDIR /driftnet
+RUN sed -i 's/#CFLAGS += -DNO_DISPLAY_WINDOW/CFLAGS += -DNO_DISPLAY_WINDOW/g' Makefile
+RUN sed -i 's/CFLAGS  += `pkg-config --cflags gtk+-2.0` `pkg-config --cflags libpng`//g' Makefile
+RUN sed -i 's/LDLIBS  += -ljpeg -lgif `pkg-config --libs gtk+-2.0` `pkg-config --libs libpng`//g' Makefile
+RUN make
+
+
+### Dofler Driftnet Image ###
+FROM node:9.1-alpine
 ENV MONITOR_INTERFACE ""
 ENV IMAGE_PATH "/images"
 ENV DOFLER_ADDRESS ""
 
-RUN apk add --update --no-cache git build-base libpcap libpcap-dev                                              \
-    && git clone https://github.com/bldewolf/driftnet.git /driftnet                                             \
-    && cd /driftnet                                                                                             \
-    && sed -i 's/#CFLAGS += -DNO_DISPLAY_WINDOW/CFLAGS += -DNO_DISPLAY_WINDOW/g' Makefile                       \
-    && sed -i 's/CFLAGS  += `pkg-config --cflags gtk+-2.0` `pkg-config --cflags libpng`//g' Makefile            \
-    && sed -i 's/LDLIBS  += -ljpeg -lgif `pkg-config --libs gtk+-2.0` `pkg-config --libs libpng`//g' Makefile   \
-    && make                                                                                                     \
-    && cp driftnet /usr/bin                                                                                     \
-    && cd /app                                                                                                  \
-    && npm install                                                                                              \
-    && mkdir -p /images                                                                                         \
-    && rm -rf /driftnet                                                                                         \
-    && apk del --no-cache git build-base
-
+# install the dependencies from apk, pull in driftnet from the builder image,
+# and then pull in the parser code.
+RUN apk -U add --no-cache libpcap
+COPY --from=builder /driftnet/driftnet /usr/bin/
 COPY app /opt/app
+
+# Install the needed dependencies from NPM
+WORKDIR /opt/app
+RUN npm install .
+
 VOLUME /images
 
 CMD ["node", "/opt/app/index.js"]