Build and test webR

Don't install `LinkingTo` dependencies #809

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Run time

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Job	Run time
build-nix	3h 1m 46s
build-nix	3h 1m 46s
build-webr	25m 2s
build-webr	25m 2s
build-docker	4m 35s
build-docker	8s
	6h 58m 19s