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Make linked datasets read-only #5947

Job	Run time
macOS 12/x86_64	25m 32s
macOS 12/arm64	9m 47s
Linux dev	15m 24s
Windows 2019/x64	20m 45s
Linux amd64	43m 48s
Linux arm64	44m 17s
Linux dev+vendor	2m 14s
Install-check: tgz-ubuntu-22.04/amd64	38s
Install-check: ubuntu-22.04/amd64	39s
Install-check: ubuntu-20.04/amd64	33s
Install-check: ubuntu-18.04/amd64	39s
Install-check: debian-stable/amd64	31s
Install-check: debian-oldstable/amd64	34s
Install-check: amazonlinux-2023/amd64	41s
Install-check: fedora-latest/amd64	1m 17s
Install-check: almalinux-9/amd64	36s
Install-check: almalinux-8/amd64	39s
Install-check: tgz-ubuntu-22.04/arm64	44s
Install-check: ubuntu-22.04/arm64	46s
Install-check: ubuntu-20.04/arm64	47s
Install-check: ubuntu-18.04/arm64	51s
Install-check: debian-stable/arm64	50s
Install-check: debian-oldstable/arm64	55s
Install-check: amazonlinux-2023/arm64	54s
Install-check: fedora-latest/arm64	1m 16s
Install-check: almalinux-9/arm64	1m 5s
Install-check: almalinux-8/arm64	1m 0s
	2h 57m 42s

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