try publishing code coverage as comment

Author: marcello romani

.github/workflows/pr-comment.yaml

@@ -15,7 +15,7 @@ jobs:
       - name: Test
         id: test
         run: |
-          echo "coverage=<<EOF >> "$GITHUB_OUTPUT"
+          echo "coverage=<<EOF" >> "$GITHUB_OUTPUT"
           make test-gha >> "$GITHUB_OUTPUT"
           echo "EOF" >> "$GITHUB_OUTPUT"