perf: Reduce docker image (#1064)

* Add .dockerignore file to clean image building area

* Optimize docker image build

.dockerignore

@@ -0,0 +1,18 @@
+.git
+BREAKING_CHANGES.md
+CONTRIBUTING.md
+docs
+README.md
+tests
+.DS_Store
+/node_modules
+/__sapper__
+/mastodon
+/mastodon.log
+/src/template.html
+/static/*.css
+/static/robots.txt
+/static/inline-script.js.map
+/static/emoji-mart-all.json
+/src/inline-script/checksum.js
+yarn-error.log

Dockerfile

@@ -6,15 +6,17 @@ WORKDIR /app
 ADD . /app
 
 # Install updates and NodeJS+Dependencies
-RUN apk update && apk upgrade
-RUN apk add nodejs npm git python build-base clang
-
+RUN apk add --update --no-cache --virtual build-dependencies git python build-base clang \
+# Install updates and NodeJS+Dependencies
+ && apk add --update --no-cache nodejs npm \
 # Install yarn
-RUN npm i yarn -g
-
+ && npm i yarn -g \
 # Install Pinafore
-RUN yarn --pure-lockfile
-RUN yarn build
+ && yarn --pure-lockfile \
+ && yarn build \
+ && rm -rf ./src \
+# Cleanup
+ && apk del build-dependencies
 
 # Expose port 4002
 EXPOSE 4002