ci: retrieve Node.js version from `.nvmrc` #5535

Job	Run time
build-compiler (ubuntu-latest, ocaml-variants.5.2.1+options,ocaml-option-static, true, true, true...	3m 12s
build-rewatch (macos-13, x86_64-apple-darwin)	17s
build-compiler (buildjet-2vcpu-ubuntu-2204-arm, ocaml-variants.5.2.1+options,ocaml-option-static,...	7m 2s
build-rewatch (macos-14, aarch64-apple-darwin)	14s
build-compiler (macos-13, 5.2.1, true)	4m 39s
build-compiler (macos-14, 5.2.1, true)	2m 31s
build-compiler (windows-latest, 5.2.1, true)	3m 29s
build-rewatch (ubuntu-latest, x86_64-unknown-linux-musl)	12s
build-rewatch (buildjet-2vcpu-ubuntu-2204-arm, aarch64-unknown-linux-musl)	16s
build-compiler (ubuntu-latest, ocaml-variants.5.0.0+options,ocaml-option-static)	1m 48s
build-rewatch (windows-latest, x86_64-pc-windows-gnu)	24s
build-compiler (ubuntu-latest, ocaml-variants.4.14.2+options,ocaml-option-static)	1m 57s
build-compiler (ubuntu-latest, ocaml-variants.4.13.0+options,ocaml-option-static)	1m 58s
package	40s
installationTest (macos-13)	36s
installationTest (macos-14)	16s
installationTest (ubuntu-latest)	12s
installationTest (buildjet-2vcpu-ubuntu-2204-arm)	33s
installationTest (windows-latest)	54s
publish	0s
	31m 10s

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