Update .gitlab-ci.yml: installing a newer of python-sphinx

.gitlab-ci.yml

@@ -299,9 +299,19 @@ pages:
     # since they don't need to be part of the dev container for running, only
     # for building documentation. This shaves ~600MB off the size of the gstlal-dev
     # container:
-    - yum -y install texlive-base texlive-dvipng python-sphinx
+    - yum -y install texlive-base texlive-dvipng
     - yum -y install texlive-latex texlive-latex-base-doc texlive-latex-fonts texlive-latex-bin texlive-latex-bin-bin
     - yum -y install texlive-pictures texlive-pstricks texlive-pstricks-doc
+    
+    # Download and install phython-sphinx. The version available for SL7 (1.1)
+    # is too old (see errors in previous piplines). But newer versions won't
+    # install on SL7 because setuptools is too old. I (Alex) recurred to find
+    # the newest version that would actually install.
+    - wget https://github.com/sphinx-doc/sphinx/archive/1.5.zip
+    - unzip 1.5.zip
+    - cd sphinx-1.5/
+    - python setup.py install --prefix=${GSTLAL_DIR}
+    
     - export GSTLAL_FIR_WHITEN=0
     - export TMPDIR=tmp/ 
     - cd doc; make html