Add linting to CI

.github/workflows/uvm_ci.yaml

@@ -73,7 +73,14 @@ jobs:
         run: |
           cd verify/uvm-python
           make lint BUS_TYPE=APB
-
+          cnt=$(grep -c "Error" "verify/uvm-python/sim/lint.log")
+          if ! [[ $cnt ]]; then cnt=0; fi
+          if [[ $cnt -eq 1 ]]; then exit 0; fi
+          exit 2
+          cnt=$(grep -c "Warning" "verify/uvm-python/sim/lint.log")
+          if ! [[ $cnt ]]; then cnt=0; fi
+          if [[ $cnt -eq 1 ]]; then exit 0; fi
+          exit 2
       - name: Upload lint results
         if: failure()
         uses: actions/upload-artifact@v2