Upload test coverage to codecov (#2406)

* Add CI task to upload test coverage to codecov

Backstage CLI runs tests in coverage mode. Jest generates coverage reports in individual
coverage/ directories of packages.
We don't need a Codecov token here because our repository is public

* Upload test coverage on master build

* tests and coverage upload have to be run in same CI task

* try coverage report with yarn test:all

* Use yarn test and test:all commands

* Use lower level commands on CI

* CLI working ✅

* Do not upload partial coverage reports

.github/workflows/ci.yml

@@ -93,9 +93,11 @@ jobs:
         if: ${{ steps.yarn-lock.outcome == 'success' }}
         run: yarn lerna -- run test --since origin/master -- --coverage
 
-      - name: test all packages
+      - name: test all packages (and upload coverage)
         if: ${{ steps.yarn-lock.outcome == 'failure' }}
-        run: yarn lerna -- run test -- --coverage
+        run: |
+          yarn lerna -- run test -- --coverage
+          bash <(curl -s https://codecov.io/bash)
 
       - name: verify plugin template
         run: yarn lerna -- run diff -- --check

.github/workflows/master.yml

@@ -59,8 +59,10 @@ jobs:
       - name: verify type dependencies
         run: yarn lint:type-deps
 
-      - name: test
-        run: yarn lerna -- run test -- --coverage
+      - name: test (and upload coverage)
+        run: |
+          yarn lerna -- run test -- --coverage
+          bash <(curl -s https://codecov.io/bash)
 
       # Publishes current version of packages that are not already present in the registry
       - name: publish