[QC-953] mergers can receive labels through config

[Barthelemy]

No description provided.

[Barthelemy]

@knopers8 Could you review when you got a moment ?

[ktf]

Can we go forward with this? As I understand it block the deployment of the expendable tasks.

[Barthelemy]

@ktf could you have a look and approve ? Piotr is on holidays

[alibuild]

Error while checking build/O2/fullCI for d52453c at 2023-12-12 10:00:

## sw/BUILD/O2-latest/log
c++: error: unrecognized command-line option '--rtlib=compiler-rt'
c++: error: unrecognized command-line option '--rtlib=compiler-rt'
c++: error: unrecognized command-line option '--rtlib=compiler-rt'
c++: error: unrecognized command-line option '--rtlib=compiler-rt'
/sw/slc8_x86-64/GCC-Toolchain/v12.2.0-alice1-5/include/c++/12.2.0/bits/predefined_ops.h:45:23: error: no match for 'operator<' (operand types are 'o2::framework::DataProcessorLabel' and 'o2::framework::DataProcessorLabel')
/sw/slc8_x86-64/GCC-Toolchain/v12.2.0-alice1-5/include/c++/12.2.0/bits/predefined_ops.h:98:22: error: no match for 'operator<' (operand types are 'o2::framework::DataProcessorLabel' and 'o2::framework::DataProcessorLabel')
/sw/slc8_x86-64/GCC-Toolchain/v12.2.0-alice1-5/include/c++/12.2.0/bits/predefined_ops.h:69:22: error: no match for 'operator<' (operand types are 'o2::framework::DataProcessorLabel' and 'o2::framework::DataProcessorLabel')
ninja: build stopped: subcommand failed.

Full log here.

[Barthelemy]

Should be good now

[Barthelemy]

@ktf perhaps you could merge it ?