Bump cachix/install-nix-action from V28 to 30 in the github-actions group across 1 directory #606

Job	Run time
can_see_status	1s
docker-publish / docker_build	33s
ci_go / go_tests / test	24s
ci_go / go_lints / lint	35s
ci_nix / nix_lints / nix fmt .	24s
ci_nix / nix_test / nix flake check .	4m 8s
ci_go / go_build (.) / build	16s
ci_nix / build / nix build .#	30s
ci_nix / build (tsnsrvOciImage) / nix build .#tsnsrvOciImage	24s
can_enqueue	1s
can_merge	0s
	7m 16s

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