ci: generate test coverage lcov info

Author: adikari

.github/workflows/build.yml

@@ -18,6 +18,7 @@ jobs:
         uses: actions/setup-node@v1
         with:
           node-version: ${{ matrix.node-version }}
+
       - run: yarn install --frozen-lockfile
 
       - run: yarn test

jest.config.js

@@ -8,7 +8,11 @@ module.exports = {
     '!**/node_modules/**'
   ],
   coverageDirectory: 'coverage',
-  coverageReporters: ['text', 'text-summary', 'html'],
+  coverageReporters: [
+    ['lcovonly', { projectRoot: __dirname }],
+    'text-summary',
+    'html'
+  ],
   testMatch: ['**/?(*.)+(spec|test).[tj]s?(x)'],
   watchman: true,
   coverageThreshold: {