feat(cmd): change BuildCommand into slice #2253

Job	Run time
skip-check	4s
changes	7s
build-edk2 (edk2-stable202208)	2m 1s
build-stitching (4.19, amd64)	1m 6s
build-edk2 (edk2-stable202211)	2m 0s
build-coreboot (4.19, amd64)	2m 50s
build-stitching (4.19, arm64)	23s
build-linux (6.1.45, amd64)	3m 29s
build-coreboot (4.19, arm64)	23s
build-linux (6.1.45, arm64)	52s
build-uroot (0.14.0, amd64)	1m 46s
build-coreboot (4.20.1, amd64)	2m 36s
build-linux (6.1.111, amd64)	3m 16s
test-operating-systems (ubuntu-latest, 0.14.0)	38s
build-uroot (0.14.0, arm64)	23s
build-coreboot (4.20.1, arm64)	24s
build-linux (6.1.111, arm64)	48s
build-coreboot (4.21, amd64)	2m 46s
test-operating-systems (windows-latest, 0.14.0)	2m 0s
build-linux (6.6.52, amd64)	3m 46s
build-coreboot (4.21, arm64)	27s
test-operating-systems (macos-latest, 0.14.0)	1m 20s
build-linux (6.6.52, arm64)	40s
build-coreboot (24.02, amd64)	2m 40s
build-linux (6.9.9, amd64)	3m 35s
build-linux (6.9.9, arm64)	51s
build-coreboot (24.02, arm64)	25s
build-linux (6.11, amd64)	4m 10s
build-linux (6.11, arm64)	48s
status-check-example	2s
	46m 36s

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