CI: Add missing sphinx dependency

.docker/Dockerfile

@@ -37,6 +37,7 @@ RUN pip3 install --break-system-packages \
   pylint \
   recommonmark \
   sphinx-rtd-theme \
+  sphinx-jsonschema \
   ;
 COPY .docker/wait-for-it.sh /wait-for-it.sh
 ARG PYLIB

README_SETUP.md

@@ -24,6 +24,7 @@ dependencies, i.e., `pip install .[h5-crawler,spss]`.
 - `sphinx-autoapi`
 - `recommonmark`
 - `sphinx-rtd-theme`
+- `sphinx-jsonschema`
 
 ### How to contribute ###