Update secret name.

Signed-off-by: Max Lambrecht <maxlambrecht@gmail.com>

.github/workflows/gradle.yml

@@ -31,7 +31,8 @@ jobs:
         run: ./gradlew assemble test
       - name: Generate and upload coverage report
         env:
-          COVERALLS_REPO_TOKEN: ${{ secrets.CoverallsRepoToken }}
+          COVERALLS_SERVICE_NAME: 'github-actions'
+          COVERALLS_REPO_TOKEN: ${{ secrets.COVERALLS_REPO_TOKEN }}
         run: ./gradlew build jacocoTestReport coveralls
       - uses: actions/upload-artifact@v2
         with: