CI should check that the standard cells pass the GF180MCU DRC rules

[mithro]

CI on this repository should verify that the standard cells pass the GF180MCU DRC rules.

Example GitHub Action at https://github.com/google/skywater-pdk-actions/tree/main/run-drc-for-cell-gds-using-magic

[atorkmabrains]

@mithro That's already done here: https://github.com/mabrains/globalfoundries-pdk-libs-gf180mcu_fd_pr/blob/main/.github/workflows/drc_gf180mcu_fd_sc_mcu7t5v0_test.yml#L68