Dockerfile : Lock down sphinxcontrib versions

Otherwise a simple `pip install sphinx==4.3.1` can pull in incompatible sphinxcontrib versions that prevent sphinx from running. Removing these packages also prevents sphinx from running, so we need to install specific versions of each...
GafferHQ · Jan 16, 2024 · 9ebc8ff · 9ebc8ff
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diff --git a/Changes.md b/Changes.md
@@ -1,3 +1,9 @@
+3.0.0ax
+=======
+
+- Dockerfile :
+  - Fixed `sphinx` incompatibility with automatically installed dependencies by installing specific versions of `sphinxcontrib` packages.
+
 3.0.0a3
 =======
 

diff --git a/Dockerfile b/Dockerfile
@@ -46,6 +46,12 @@ RUN yum install -y 'dnf-command(versionlock)' && \
 # (in GafferHQ/gaffer).
 	pip install \
 		sphinx==4.3.1 \
+		sphinxcontrib-applehelp==1.0.4 \
+		sphinxcontrib-devhelp==1.0.2 \
+		sphinxcontrib-htmlhelp==2.0.1 \
+		sphinxcontrib-jsmath==1.0.1 \
+		sphinxcontrib-serializinghtml==1.1.5 \
+		sphinxcontrib-qthelp==1.0.3 \
 		sphinx_rtd_theme==1.0.0 \
 		myst-parser==0.15.2 \
 		docutils==0.17.1 && \