Add GitHub workflow for release branch

Author: vladdeSV

.github/workflows/Release Branch.yml

@@ -0,0 +1,25 @@
+name: release
+
+on:
+  push:
+    branches: [ release ]
+  pull_request:
+    branches: [ release ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Install dependencies
+        run: composer install --prefer-dist --no-progress --no-suggest
+
+      - name: Test with PHPUnit, generate code coverage
+        run: php ./vendor/phpunit/phpunit/phpunit --coverage-clover=coverage.xml
+
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v1
+        with:
+          file: ./coverage.xml