[Backport branch/3.5.x] Add inputs for controlling which repo and branch are checked out

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Description

Backport of #10873 to branch/3.5.x.

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[wmaxey]

/ok to test 59fb383

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⏱️ CCCL compile-time benchmark comparison: Public headers compile-time bench

Result: 1 regression row(s), 8 improvement row(s) above threshold.

Run	Value
Config	public-headers-gcc13
Baseline	origin/main
Preset	all-dev
Targets	cub.headers.base, thrust.cpp.cuda.headers.base, libcudacxx.test.public_headers
GPU / launch args	rtx2080 / --cuda 13.3 --host gcc13

Artifacts: reports and traces

Direct file processing

-f file-processing exclusive --sort total

🔴 Direct file processing — Regressions

Rank	Regression impact	Selected Δ	Baseline	Current	Event	Matched traces
1	2.083771	2.083771	0.170773	2.254544	Processing Header File: cub/cub/device/dispatch/tuning/common.cuh	131

🟢 Direct file processing — Improvements

Rank	Improvement impact	Selected Δ	Baseline	Current	Event	Matched traces
1	8.463468	-8.463468	18.078216	9.614748	Processing Header File: libcudacxx/include/cuda/__device/physical_device.h	93
2	1.247117	-1.247117	5.436808	4.189691	Processing Header File: libcudacxx/include/cuda/std/__cccl/prologue.h	548
3	0.302113	-0.302113	0.927975	0.625862	Processing Header File: libcudacxx/include/cuda/std/__functional/operations.h	278
4	0.254806	-0.254806	5.418236	5.163430	Processing Header File: libcudacxx/include/cuda/std/__iterator/concepts.h	436
5	0.234585	-0.234585	0.235245	0.000660	Processing Header File: cub/cub/device/device_run_length_encode.cuh	2
6	0.234014	-0.234014	0.568479	0.334465	Processing Header File: cub/cub/device/dispatch/dispatch_batched_topk.cuh	3
7	0.216447	-0.216447	1.671902	1.455455	Processing Header File: libcudacxx/include/cuda/std/__cccl/epilogue.h	548
8	0.205179	-0.205179	1.503549	1.298370	Processing Header File: libcudacxx/include/cuda/std/__atomic/functions/cuda_ptx_generated.h	56

[github-actions]

😬 CI Workflow Results

🟥 Finished in 3h 14m: Pass: 99%/504 | Total: 13d 09h | Max: 2h 56m | Hits: 52%/1775949

See results here.