feat(docker): add docker build

Dockerfile

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+FROM alpine:latest
+
+ENV NODE_ENV production
+
+# Debug
+RUN sed -i 's/dl-cdn.alpinelinux.org/mirrors.tuna.tsinghua.edu.cn/g' /etc/apk/repositories
+
+RUN apk --no-cache add nodejs npm nginx task
+
+COPY ./frontend /src/frontend
+COPY ./backend /src/backend
+COPY ./nginx/nginx.conf /etc/nginx/conf.d/default.conf
+COPY ./docker/start.sh /start.sh
+
+# Debug
+RUN npm config set registry https://registry.npm.taobao.org
+
+# Frontend
+RUN cd /src/frontend && npm install \
+	&& npm run build && npm run export \
+	&& cp -r /src/frontend/dist /static \
+	&& rm -r /src/frontend
+
+# Backend
+RUN cd /src/backend && npm install \
+	&& npm run build \
+	&& rm -r /src/backend/src
+
+EXPOSE 80
+
+# Taskwarrior data volumn
+VOLUME [ "/.task", "/.taskrc" ]
+
+CMD ["/start.sh"]

docker/start.sh

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+#!/bin/sh
+mkdir -p /run/nginx
+cd /src/backend
+npm start &
+nginx -g 'daemon off;'