add workflow for coverage

.github/workflows/github-workflow.yaml

@@ -45,14 +45,13 @@ jobs:
  chmod +x ./coverage.sh
  bash ./coverage.sh
 
- # Info: sed is used as the js file is no strict json format
  - name: Extract coverage percentage from index.js
  id: coverage
  shell: bash
  run: |
- coverage=$(sed -n '/var data = /,/};/p' ./coverage/test_smartmon.coverage/index.js | sed '1s/.*= //' | sed '$s/};/}/' | jq -r '.files[0].covered')
-  echo "Extracted coverage percentage: $coverage"
-  echo "::set-output name=coverage::$coverage"
+ coverage=$(grep -oP '(?<=covered":")[^"]+' ./coverage/test_smartmon.coverage/index.js | head -n 1)
+ echo "Extracted coverage percentage: $coverage"
+ echo "::set-output name=coverage::$coverage"
 
  - name: Update README.md with coverage badge
  run: |