GstLAL container should include sphinx tools needed to build documentation (if possible)
Following the writeable container based installation here:
https://lscsoft.docs.ligo.org/gstlal/installation.html
mostly works great, however the containers don't contain sphinx, e.g.,
Singularity> pwd
/ligo/home/ligo.org/chad.hanna/development/gstlal-dev/src/gstlal/doc
Singularity> make
# FIXME FIXME FIXME total hack to work around unique python packaging
if [ 0 = 0 ]; then \
mv ../gstlal/python/__init__.py ../gstlal/python/__init__.py.bk; \
fi
sphinx-apidoc -e -o source/gstlal/python-modules ../gstlal/python ../gstlal/python/misc.py ../gstlal/python/bottle.py ../gstlal/python/coherent_null.py ../gstlal/python/matplotlibhelper.py
make: sphinx-apidoc: Command not found
make: *** [gstlal-modules] Error 127