Tweak Coveralls

Coveralls recommends using an "official integration" of their product with Github. Also, allow the upload to fail without causing the whole coverage step to fail - there have been some recent problems which they are still working on. I may allow the step to fail once they are done with their changes.

.github/workflows/main.yml

@@ -254,11 +254,12 @@ jobs:
 
       - name: Upload coverage results to Coveralls
         env:
-          COVERALLS_REPO_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        run: |
-          wget https://github.com/php-coveralls/php-coveralls/releases/download/v2.4.3/php-coveralls.phar
-          chmod +x php-coveralls.phar
-          php php-coveralls.phar --coverage_clover=build/clover.xml --json_path=build/coveralls-upload.json -vvv
+          FAILURE_ACTION: "${{ true }}"
+        uses: coverallsapp/github-action@v2
+        with:
+            github-token: ${{ secrets.GITHUB_TOKEN }}
+            file: build/clover.xml
+            format: clover
 
   release:
     permissions: