[Whiteboard] Add a docker image for whiteboard

pica-whiteboard/Dockerfile

+FROM node:14.2.0-alpine3.11
+
+ENV WBVERSION=1.5 \
+    SCVERSION=0.1.9
+
+RUN mkdir -p /opt/app && \
+    apk add --no-cache --virtual .download ca-certificates wget && \
+    wget https://github.com/cracker0dks/whiteboard/archive/v$WBVERSION.tar.gz && \
+    wget https://github.com/aptible/supercronic/releases/download/v$SCVERSION/supercronic-linux-amd64 && \
+    chmod +x supercronic-linux-amd64 && \
+    mv supercronic-linux-amd64 /usr/local/bin/supercronic && \
+    tar -C /opt/app -xzf v$WBVERSION.tar.gz && \
+    rm v$WBVERSION.tar.gz && \
+    cd /opt/app/whiteboard-$WBVERSION && \
+    npm ci && \
+    apk del .download
+
+ADD crontab /opt/app/whiteboard-$WBVERSION/crontab
+ADD    entrypoint.sh /entrypoint.sh
+
+RUN chmod +x /entrypoint.sh
+
+EXPOSE 8080
+
+ENTRYPOINT ["/entrypoint.sh"]

pica-whiteboard/crontab

+30 * * * * pkill node
+31 * * * * cd /opt/app/whiteboard-1.5 && node server.js --mode=production

pica-whiteboard/docker-compose.yml

+version: '3'
+services:
+  app:
+    image: wb
+    build: .
+    networks:
+      - proxy
+    labels:
+      traefik.http.routers.etherpad-app.entrypoints: websecure
+      traefik.http.routers.etherpad-app.rule: Host(`wb.test.picasoft.net`)
+      traefik.http.services.etherpad-app.loadbalancer.server.port: 8080
+      traefik.enable: true
+    restart: always
+
+networks:
+  proxy:
+    external: true

pica-whiteboard/entrypoint.sh

+#! /bin/sh
+
+cd /opt/app/whiteboard-1.5
+node server.js --mode=production &
+supercronic /opt/app/whiteboard-1.5/crontab