Dockerfile

FROM alpine:latest

WORKDIR "/app"

COPY [".", "."]

RUN addgroup nodejs \
    && adduser --disabled-password -g "NodeJS" -G nodejs nodejs \
    && apk add npm \
    && npm install

# For the time being, allow proxied requests without a special HTTP Header
# by commenting out the `requireHeader` line. This can be removed when
# FullCalendar supports custom headers in eventSources. See:
# https://github.com/fullcalendar/fullcalendar/issues/4627#issuecomment-831402797
RUN sed -e "s/requireHeader:.*/requireHeader: ['CF-RAY'],/" \
        -e '/httpProxyOptions: {/a \
            secure: false,' server.js > server-cloudflare.js

USER nodejs

EXPOSE 8080

HEALTHCHECK --interval=60s --timeout=10s --start-period=60s \
    CMD ["wget", "--spider", "http://localhost:8080/"]

ENTRYPOINT ["node"]
CMD ["server-cloudflare.js"]