add coveralls.io workflow

Author: Patrick

.github/workflows/coveralls.yml

@@ -0,0 +1,44 @@
+name: Generate Coveralls Report
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    steps:
+
+      -   name: Checkout code
+          uses: actions/checkout@v2
+
+      -   name: Setup PHP
+          uses: shivammathur/setup-php@v2
+          with:
+            php-version: 7.4
+            extensions: mbstring
+            coverage: pcov
+            tools: composer:v2
+
+      -   name: Cache dependencies
+          uses: actions/cache@v2
+          with:
+            path: ~/.composer/cache/files
+            key: dependencies-php-7.4-composer-${{ hashFiles('composer.json') }}
+
+      -   name: Install dependencies
+          run: composer install --prefer-dist --no-interaction --optimize-autoloader
+
+      -   name: Generate Coverage
+          run: vendor/bin/phpunit --coverage-clover build/logs/clover.xml
+
+      - name: Upload coverage results to Coveralls
+        env:
+          COVERALLS_REPO_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          composer global require php-coveralls/php-coveralls
+          php-coveralls --coverage_clover=build/logs/clover.xml -v
+