Don't puke in the release workflow if the Nix version didn't change (… #2744

Job	Run time
Lints	2m 22s
build-aarch64-darwin / Build aarch64 Darwin (static)	2m 23s
build-aarch64-linux / Build aarch64 Linux (static)	1m 3s
build-x86_64-darwin / Build x86_64 Darwin (static)	2m 28s
build-x86_64-linux / Build x86_64 Linux (static)	1m 4s
Run aarch64 Linux (--determinate)	1m 34s
Run x86_64 Linux (No init, --determinate)	3m 43s
Run x86_64 Linux release check matrix	0s
Run aarch64 Linux	1m 21s
Run x86_64 Linux (No init)	1m 41s
Run x86_64 Linux (--determinate)	2m 0s
Run x86_64 Linux	2m 25s
Run x86_64 Linux release checks	0s
Run aarch64 Darwin (--determinate)	2m 11s
Run aarch64 Darwin	2m 14s
Run x86_64 Darwin (--determinate)	3m 59s
Run x86_64 Darwin	3m 52s
	34m 20s

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