Update dockerfile to cache dependencies

Dockerfile

@@ -3,7 +3,6 @@
 FROM quay.io/quay/quay-base:latest
 
 WORKDIR $QUAYDIR
-COPY . .
 
 # Install python dependencies
 RUN virtualenv --distribute venv \
@@ -18,11 +17,25 @@ RUN cat requirements.txt | grep -v "^-e" | awk -F'==' '{print $1}' | xargs venv/
     test -z $(cat pipinfo.txt | grep GPL | grep -v LGPL) && \
     rm pipinfo.txt
 
-# Install front-end dependencies and Optimize our images
-RUN yarn install --ignore-engines \
-    && yarn build \
-    && jpegoptim static/img/**/*.jpg \
-    && optipng -clobber -quiet static/img/**/*.png
+# Install front-end dependencies
+ADD package.json package.json
+ADD tsconfig.json tsconfig.json
+ADD webpack.config.js webpack.config.js
+ADD yarn.lock yarn.lock
+RUN yarn install --ignore-engines
+
+# Add static files
+ADD static static
+
+# Run Webpack
+RUN yarn build
+
+# Optimize our images
+ADD static/img static/img
+RUN jpegoptim static/img/**/*.jpg
+RUN optipng -clobber -quiet static/img/**/*.png
+
+COPY . .
 
 # Set up the init system
 RUN mkdir -p /etc/my_init.d /etc/systlog-ng /usr/local/bin /etc/monit static/fonts static/ldn /usr/local/nginx/logs/ \
@@ -42,5 +55,4 @@ RUN mkdir -p /etc/my_init.d /etc/systlog-ng /usr/local/bin /etc/monit static/fon
 #     && apt-get clean
 #     && rm -rf /root/.npm /.npm /usr/local/lib/node_modules /usr/share/yarn/node_modules \
 #            /root/node_modules /node_modules /grunt
-RUN ln -s /conf $QUAYCONF
 RUN PYTHONPATH=$QUAYPATH venv/bin/alembic heads | grep -E '^[0-9a-f]+ \(head\)$' > ALEMBIC_HEAD