`om ci`: Copy results back from remote Nix store (#360) #1400

Job	Run time
main (x86_64-linux, true)	4m 13s
main (aarch64-linux, true)	27m 11s
main (aarch64-darwin, true)	4m 24s
main (x86_64-darwin, true)	4m 46s
static-binary-check (ubuntu-latest)	2s
static-binary-check (macos-latest)	4s
website / upload	9s
website / deploy	9s
	40m 58s

Provide feedback