The only remaining DRC issue is the NDRES.4 rule, which is flagged in the I/O cells.
However, as this rule is not even included in the open PDK docs, I will disable it for now while Tim E. reviews it.
There have also been changes to the template, so:
1. git pull the latest changes to the template
2. make clone-pdk
3. nix-shell
4. make librelane
Once we have upstreamed all our changes to the PDK, step 2 will no longer be necessary.