Make it a ext #3

Job	Run time
downgrade (1.10, core)	13m 17s
test (1.10, ubuntu-latest, core)	13m 15s
test (1.10, ubuntu-latest, adjoint)	8m 36s
downgrade (1.10, adjoint)	8m 25s
test (1.10, ubuntu-latest, alloc_check)	8m 30s
downgrade (1.10, alloc_check)	8m 37s
test (1.10, macos-latest, core)	14m 37s
test (1.10, macos-latest, adjoint)	7m 55s
test (1.10, macos-latest, alloc_check)	6m 33s
test (1.10, windows-latest, core)	14m 58s
test (1.10, windows-latest, adjoint)	10m 0s
test (1.10, windows-latest, alloc_check)	10m 5s
test (1, ubuntu-latest, core)	22m 8s
test (1, ubuntu-latest, adjoint)	15m 39s
test (1, ubuntu-latest, alloc_check)	14m 36s
test (1, macos-latest, core)	16m 30s
test (1, macos-latest, adjoint)	10m 1s
test (1, macos-latest, alloc_check)	10m 4s
test (1, windows-latest, core)	23m 26s
test (1, windows-latest, adjoint)	17m 41s
test (1, windows-latest, alloc_check)	16m 21s
	4h 31m 14s

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