Expose port 3001 for safe http port ; fix STORAGE variable so it doesn't break the config at runtime

Dockerfile

@@ -8,13 +8,13 @@ RUN apk add --no-cache git tini \
    && npm install -g bower \
    && bower install --allow-root
 
-EXPOSE 3000
+EXPOSE 3000 3001
 
 VOLUME /cryptpad/datastore
 VOLUME /cryptpad/customize
 
 ENV USE_SSL=false
-ENV STORAGE='./storage/file'
+ENV STORAGE=\'./storage/file\'
 ENV LOG_TO_STDOUT=true
 
 CMD ["/sbin/tini", "--", "/cryptpad/container-start.sh"]