Enable build concurrency for nightly and merge triggers. #3516

Job	Run time
checks / other-checks	34s
checks / check-style	1m 42s
devcontainer / build (amd64, 12.0, conda)	12m 38s
devcontainer / build (amd64, 12.0, pip)	12m 5s
conda-cpp-build / compute-matrix	3s
wheel-build-pylibraft / compute-matrix	3s
conda-cpp-build / build (11.8.0, ubuntu22.04, amd64, 3.10)	10m 6s
conda-cpp-build / build (11.8.0, ubuntu22.04, arm64, 3.10)	9m 39s
conda-cpp-build / build (12.0.1, ubuntu22.04, amd64, 3.10)	10m 7s
conda-cpp-build / build (12.0.1, ubuntu22.04, arm64, 3.10)	9m 40s
wheel-build-pylibraft / 11.8.0, 3.9, amd64, centos7	7m 23s
wheel-build-pylibraft / 11.8.0, 3.10, amd64, centos7	7m 12s
wheel-build-pylibraft / 11.8.0, 3.9, arm64, rockylinux8	5m 47s
wheel-build-pylibraft / 11.8.0, 3.10, arm64, rockylinux8	5m 42s
wheel-build-pylibraft / 12.0.1, 3.9, amd64, centos7	7m 7s
wheel-build-pylibraft / 12.0.1, 3.10, amd64, centos7	7m 8s
wheel-build-pylibraft / 12.0.1, 3.9, arm64, rockylinux8	6m 14s
wheel-build-pylibraft / 12.0.1, 3.10, arm64, rockylinux8	6m 11s
wheel-tests-pylibraft / compute-matrix	4s
wheel-tests-pylibraft / 11.8.0, 3.9, amd64, ubuntu18.04, v100	1m 35s
wheel-tests-pylibraft / 12.0.1, 3.10, amd64, ubuntu20.04, v100	36s
wheel-tests-pylibraft / 12.0.1, 3.9, arm64, ubuntu20.04, a100	1s
wheel-build-raft-dask	1s
wheel-tests-raft-dask	1s
conda-cpp-tests	1s
conda-cpp-checks	1s
conda-python-build	1s
docs-build	1s
conda-python-tests	1s
pr-builder	1s
	2h 1m 45s

Provide feedback