This wasn't working because yerenSystem wasn't actually accessing the
`system` attribute (like the other systems), which meant it was just
an attribute set full of stuff.
Change-Id: I0abe56f0a1f18e4e542cb458dfcdf81e8a0ddc01
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2923
Tested-by: BuildkiteCI
Reviewed-by: glittershark <grfn@gws.fyi>