Merge #5023
5023: fix CI not running on bors branches r=disassembler a=dermetfan Looks like this was broken in #4930 as `prAndBorsIo` was added but not used. Also removed `nix` from the task name. I do not see what purpose it has and it makes the names unnecessarily long. Also we happen to need the old names in #5018. Co-authored-by: Robin Stumm <[email protected]>