improvements for Docker

Dockerfile

+FROM debian:buster-slim as git-fetcher
+
+RUN apt update && \
+    env DEBIAN_FRONTEND=noninteractive apt install -y git && \
+    rm -rf /var/lib/apt/lists/*
+
+COPY . /taiko-web
+WORKDIR /taiko-web
+RUN git log -1 --pretty="format:{\"commit\": \"%H\", \"commit_short\": \"%h\", \"version\": \"TAIKO_VERSION\", \"url\": \"TAIKO_GIT_URL\"}" > ./version.json
+
 FROM node:buster-slim
 
 #RUN sed -i 's/deb.debian.org/mirrors.163.com/g' /etc/apt/sources.list && \
@@ -5,11 +15,11 @@ FROM node:buster-slim
 
 #dependencies
 RUN apt update && \
-    env DEBIAN_FRONTEND=noninteractive apt install -y git python2.7 python-virtualenv python3.5 python3-virtualenv ffmpeg nginx && \
+    env DEBIAN_FRONTEND=noninteractive apt install -y python2.7 python-virtualenv python3.5 python3-virtualenv ffmpeg nginx && \
     rm -rf /var/lib/apt/lists/* && \
     npm install -g pm2
 
-COPY . /taiko-web
+COPY --from=git-fetcher . /taiko-web
 WORKDIR /taiko-web
 
 # envs

docker/entrypoint.sh

@@ -6,6 +6,8 @@ if [ -z $TAIKO_ASSETS_URL ]; then
 	export TAIKO_ASSETS_URL=$TAIKO_URL/assets/
 fi
 echo "{\"songs_baseurl\":\"$TAIKO_SONGS_URL\",\"assets_baseurl\":\"$TAIKO_ASSETS_URL\",\"multiplayer_baseurl\":\"$TAIKO_MULTIPLAYER_URL\",\"email\":\"$TAIKO_EMAIL\",\"redis_host\":\"$TAIKO_REDIS_HOST\",\"redis_port\":$TAIKO_REDIS_PORT,\"redis_password\":\"$TAIKO_REDIS_PASSWORD\",\"redis_db\":$TAIKO_REDIS_DB,\"git_url\":\"$TAIKO_GIT_URL\"}" | tee ./config.json
-echo "{\"commit\":\"$(git log --pretty=%H -1)\",\"commit_short\":\"$(git log --pretty=%h -1)\",\"version\": \"$TAIKO_VERSION\"}" | tee ./version.json
+sed -i	-e "s#TAIKO_GIT_URL#$TAIKO_GIT_URL#g" && \
+ 		-e "s#TAIKO_VERSION#$TAIKO_VERSION#g" ./version.json
+cat version.json
 
 pm2-docker start ./docker/pm2-docker.json