Set global CPU_COUNT variable for all CI jobs
Description
This MR abstracts the number of cores available on the runners to a single global variable, then reconfigures the various build jobs to use it. In particular the variable is called CPU_COUNT which is what conda build natively uses, and the rpmbuild variable was subtly fixed from RPM_BUILD_CPUS to RPM_BUILD_NCPUS.
This probably has the impact of slowing down the pipeline, but it will make the lalsuite CI a better citizen of the runner, since jobs will no longer be trying to parallelise over the whole 32/64-core machine.
API Changes and Justification
Backwards Compatible Changes
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This change introduces no API changes -
This change adds new API calls
Backwards Incompatible Changes
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This change modifies an existing API -
This change removes an existing API
If any of the Backwards Incompatible check boxes are ticked please provide a justification why this change is necessary and why it needs to be done in a backwards incompatible way.