from etherpad/etherpad
run npm install npm uninstall node-pre-gyp --save && \
    npm install @mapbox/node-pre-gyp --save
run npm install sqlite3@4
run npm install ep_headerauth@1.1.7 
run npm install ep_image_upload@1.0.32
run npm install ep_headings2 ep_align ep_font_color ep_embedded_hyperlinks2
copy services/etherpad/settings.json.docker ./settings.json