nit nit

.github/workflows/main.yml

@@ -60,3 +60,18 @@ jobs:
       - name: Report coverage
         run: |
           coverage report
+
+      - name: Retrieve baseline coverage
+        run: |
+          git fetch origin main:main
+          baseline_coverage=$(git show main:.coverage | coverage report -m | sed -n '/TOTAL/ s/.*\s\([0-9.]*%\).*/\1/p' | sed 's/%//')
+          echo "$baseline_coverage" > .coverage_baseline
+  
+      - name: Compare coverage with baseline
+        run: |
+          current_coverage=$(coverage report -m | sed -n '/TOTAL/ s/.*\s\([0-9.]*%\).*/\1/p' | sed 's/%//')
+          baseline_coverage=$(cat .coverage_baseline)
+          if (( current_coverage < baseline_coverage )); then
+            echo "Coverage decreased from $baseline_coverage% to $current_coverage%"
+            exit 1
+          fi