Work around `COPY --link` limitations by pre-creating full filesystem tree #487

Job	Run time
Generate Jobs	40s
1.22.4-bookworm	36s
1.22.4-bullseye	31s
1.22.4-alpine3.20	29s
1.22.4-alpine3.19	24s
1.22.4-windowsservercore-ltsc2022, 1.22.4-nanoserver-ltsc2022	14m 2s
1.22.4-windowsservercore-1809, 1.22.4-nanoserver-1809	8m 55s
1.21.11-bookworm	31s
1.21.11-bullseye	38s
1.21.11-alpine3.20	24s
1.21.11-alpine3.19	24s
1.21.11-windowsservercore-ltsc2022, 1.21.11-nanoserver-ltsc2022	21m 44s
1.21.11-windowsservercore-1809, 1.21.11-nanoserver-1809	13m 4s
	1h 2m 22s

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