lcov needs relative paths

.github/workflows/build-ubuntu.yml

@@ -72,9 +72,10 @@ jobs:
       - name: Generate Reports
         run: |
           echo "Merging Coverage Data..."
-          verilator_coverage --write-info riscof_work/coverage.info riscof_work/rv64i_m/*/src/*/dut/coverage.dat
+          cd riscof_work
+          verilator_coverage --write-info coverage.info rv64i_m/*/src/*/dut/coverage.dat
           echo "Generating HTML Coverage Report..."
-          genhtml riscof_work/coverage.info -o riscof_work/coverage.html
+          genhtml coverage.info -o coverage.html
 
       - name: Upload Artifacts
         uses: actions/upload-artifact@v4