Cleanup Dockerfile, thanks to @kpcyrd

Dockerfile

@@ -1,28 +1,13 @@
-FROM node:6
-
-ARG VERSION=0.3.0
-
-# Download stable version
-# RUN wget https://github.com/xwiki-labs/cryptpad/archive /${VERSION}.tar.gz -O /cryptpad.tar.gz \
-#   && mkdir -p /cryptpad \
-#   && tar -xzf /cryptpad.tar.gz -C /cryptpad --strip-components=1 \
-#   && rm /cryptpad.tar.gz
-
-# Download from github
-# RUN git clone https://github.com/xwiki-labs/cryptpad.git
-
-# Add code directly
-ADD . /cryptpad
+FROM node:6-alpine
 
+COPY . /cryptpad
 WORKDIR /cryptpad
 
-RUN npm install \
+RUN apk add --no-cache git tini \
+   && npm install \
    && npm install -g bower \
    && bower install --allow-root
 
-ADD container-start.sh /container-start.sh
-RUN chmod u+x /container-start.sh
-
 EXPOSE 3000
 
 VOLUME /cryptpad/datastore
@@ -32,4 +17,4 @@ ENV USE_SSL=false
 ENV STORAGE='./storage/file'
 ENV LOG_TO_STDOUT=true
 
-CMD /container-start.sh
+CMD ["/sbin/tini", "--", "/cryptpad/container-start.sh"]

container-start.sh

@@ -1,22 +1,22 @@
-#!/bin/bash
+#!/bin/sh
 
 # Creating customize folder
 mkdir -p customize
-[[ ! "$(ls -A customize)" ]] && echo "Creating customize folder" \
+[ -z "$(ls -A customize)" ] && echo "Creating customize folder" \
   && cp -R customize.dist/* customize/ \
   && cp config.js.dist customize/config.js
 
 # Linking config.js 
-[[ ! -h config.js ]] && echo "Linking config.js" && ln -s customize/config.js config.js
+[ ! -h config.js ] && echo "Linking config.js" && ln -s customize/config.js config.js
 
 # Configure 
-[[ -n "$USE_SSL" ]] && echo "Using secure websockets: $USE_SSL" \
+[ -n "$USE_SSL" ] && echo "Using secure websockets: $USE_SSL" \
   && sed -i "s/useSecureWebsockets: .*/useSecureWebsockets: ${USE_SSL},/g" customize/config.js
 
-[[ -n "$STORAGE" ]] && echo "Using storage adapter: $STORAGE" \
+[ -n "$STORAGE" ] && echo "Using storage adapter: $STORAGE" \
   && sed -i "s/storage: .*/storage: ${STORAGE},/g" customize/config.js
 
-[[ -n "$LOG_TO_STDOUT" ]] && echo "Logging to stdout: $LOG_TO_STDOUT" \
+[ -n "$LOG_TO_STDOUT" ] && echo "Logging to stdout: $LOG_TO_STDOUT" \
   && sed -i "s/logToStdout: .*/logToStdout: ${LOG_TO_STDOUT},/g" customize/config.js