Merge #258573: nixos/release-combined: make gitlab a channel blocker

+1
+1
nixos/release-combined.nix
··· 79 80 (onFullSupported "nixos.tests.firewall") 81 (onFullSupported "nixos.tests.fontconfig-default-fonts") 82 (onFullSupported "nixos.tests.gnome") 83 (onFullSupported "nixos.tests.gnome-xorg") 84 (onSystems ["x86_64-linux"] "nixos.tests.hibernate")
··· 79 80 (onFullSupported "nixos.tests.firewall") 81 (onFullSupported "nixos.tests.fontconfig-default-fonts") 82 + (onFullSupported "nixos.tests.gitlab") 83 (onFullSupported "nixos.tests.gnome") 84 (onFullSupported "nixos.tests.gnome-xorg") 85 (onSystems ["x86_64-linux"] "nixos.tests.hibernate")