Add header to release description for test coverage report

Author: AntoineBuirey

.github/workflows/OnRelease.yml

@@ -104,7 +104,7 @@ jobs:
         script: |
           const fs = require('fs');
           const coverage = fs.readFileSync('coverage-reports/coverage.3.10.md', 'utf8');
-          const releaseBody = `${coverage}\n\n${context.payload.release.body}`;
+          const releaseBody = `## Test coverage\n${coverage}\n\n${context.payload.release.body}`;
           github.rest.repos.updateRelease({
             owner: context.repo.owner,
             repo: context.repo.repo,