CTP: luminosity workflow

[Elladt]

Added workflow for calculating luminosity

[Elladt]

@lietava Here is the pull request

[lietava]

Hi @Elladt , thanks.

[lietava]

@shahor02 : why the checks are pending ?

[shahor02]

Approving conditionally to trigger CI.

@lietava @Elladt could you please comment on where and how this workflow should be used? Its DPL output is the same as of the CTP/workflow/src/RawDecoderSpec.cxx, and the code seems to be largely cloned from the latter.

[alibuild]

Error while checking build/O2/fullCI_slc9 for ea1b2de at 2026-08-23 15:24:

## sw/BUILD/O2-latest/log
/sw/SOURCES/O2/slc9_x86-64-slc9_x86-64/0/Detectors/CTP/workflowLumi/src/RawDecoderSpec.cxx:419:22: error: 'create_directories' is not a member of 'std::filesystem'
/sw/SOURCES/O2/slc9_x86-64-slc9_x86-64/0/Detectors/CTP/workflowLumi/src/RawDecoderSpec.cxx:440:20: error: 'create_directories' is not a member of 'std::filesystem'
ninja: build stopped: subcommand failed.

Full log here.