add test coverage to PR comment

.github/workflows/test.yaml

@@ -58,15 +58,10 @@ jobs:
       - name: Get changed lines in the PR
         id: get_diff
         run: |
-          # git fetch origin develop
-          # git diff origin/develop --unified=0 > diff.txt
-          # grep '^@@' diff.txt | awk '{print $2}' > changed_lines.txt
-          # cat changed_lines.txt
-
-          echo "Changed files and lines:"
-          git fetch origin ${{ github.event.pull_request.base.ref }}
-          git diff --unified=0 --no-color --exit-code origin/${{ github.event.pull_request.base.ref }} HEAD > changes.txt
-          cat changes.txt
+          git fetch origin develop
+          git diff origin/develop --unified=0 > diff.txt
+          grep '^@@' diff.txt | awk '{print $2}' > changed_lines.txt
+          cat changed_lines.txt
 
       - name: Check for untested lines
         id: check_coverage