Updated Dockerfile

Added astropy_healpix

ddf2/Dockerfile

@@ -34,7 +34,7 @@ RUN python -m pip install -U pip setuptools wheel
 RUN pip install -U pip setuptools wheel
 RUN python -m pip install numpy==1.16.2 bdsf==1.8.15 emcee
 
-RUN python -m pip install pybind11 future pyregion sshtunnel pymysql psutil
+RUN python -m pip install astropy_healpix pybind11 future pyregion sshtunnel pymysql psutil
 RUN python -m pip install -U "/opt/DDFacet/[dft-support,moresane-support,testing-requirements,fits-beam-support]"
 
 RUN cd /opt/DDFacet && rm -rf /opt/DDFacet/Dcbuild && python setup.py build