Modify Dockerfile to use cacheing

By only copying the dependency lockfiles to the directory, running yarn
install, we can utilize docker cacheing to avoid run yarn install
everytime to the image is built.

Author: mcordell

Dockerfile

@@ -8,11 +8,15 @@ RUN sed -i 's/http\:\/\/dl-cdn.alpinelinux.org/http\:\/\/mirror.clarkson.edu/g'
 
 RUN apk add --no-cache bash yarn
 
-COPY . /opt/organice
 WORKDIR /opt/organice
 
-RUN yarn install \
-    && yarn global add serve \
+COPY package.json yarn.lock /opt/organice/
+
+RUN yarn install
+
+COPY . /opt/organice
+
+RUN yarn global add serve \
     && yarn build \
     && yarn cache clean \
     && rm -rf node_modules