feat: multi-stage dockerfile

dev/build/Dockerfile

+# ====================
+# --- Build Assets ---
+# ====================
+FROM node:10-alpine AS assets
+
+RUN apk update && \
+    apk add yarn g++ make python --no-cache && \
+    rm -rf /var/cache/apk/* && \
+    mkdir -p /var/wiki
+
+WORKDIR /var/wiki
+
+COPY ./package.json /var/wiki/package.json
+COPY ./client /var/wiki/client
+
+RUN yarn
+RUN yarn build
+RUN rm -rf /var/wiki/node_modules
+RUN yarn --production
+
+# ===============
+# --- Release ---
+# ===============
 FROM node:10-alpine
 LABEL maintainer="requarks.io"
 
 RUN apk update && \
     apk add bash curl git openssh supervisor --no-cache && \
+    rm -rf /var/cache/apk/* && \
     mkdir -p /var/wiki
 
 WORKDIR /var/wiki
 
-COPY supervisord.conf /etc/supervisord.conf
-COPY . /var/wiki
+COPY ./dev/build/supervisord.conf /etc/supervisord.conf
+COPY --from=assets /var/wiki/assets ./assets
+COPY --from=assets /var/wiki/node_modules ./node_modules
+COPY ./server /var/wiki/server
+COPY ./config.sample.yml /var/wiki/config.yml
+COPY ./package.json /var/wiki/package.json
+COPY ./LICENSE /var/wiki/LICENSE
 
 EXPOSE 3000