Dockerfile fix

[anusharanganathan]

Dockerfile is failing with jessie backports.

Fix it by installing openjdk instead

    openjdk-8-jre-headless
    # # install open-jdk and ca-certs from jessie-backports
    # && apt-get install -t jessie-backports -y --no-install-recommends openjdk-8-jre-headless ca-certificates-java \
    # && apt-get clean \
    # && rm -rf /var/lib/apt/lists/* \
# && /var/lib/dpkg/info/ca-certificates-java.postinst configure

java is needed by fits and likely by libreoffice

[Steven-Eardley]

Is there any reason we can't install a more current JRE? I believe at least LibreOffice isn't fussy about which version is installed.

[anusharanganathan]

FITS probably depends on Java 7 or 8. We are using an older version of FITS. See https://github.com/samvera/hyrax#prerequisites and harvard-lts/fits#140