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ci: doc-build: Reduce parallel job count to 14
This commit reduces the parallel job count for building the documentation from the default value of 16 (i.e. `-j auto` aka. the vCPU count) to 14 because the total available RAM in the runners is 32GiB and each sphinx-build process may use more than 2GiB of RAM, which can lead to out-of-memory conditions. Note that the HTML doc build process was parallelised prior to this change in spite of the lack of `-j auto` in the CI workflow because the default `SPHINXOPTS` includes `-j auto` and only `SPHINXOPTS_EXTRA` was specified -- this commit explicitly adds the `SPHINXOPTS` for it with the default value specified in doc/CMakeLists.txt to make the job count configurable while ensuring the previous behaviour is preserved. Signed-off-by: Stephanos Ioannidis <[email protected]>
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