Adding tests for Rector with Drupal

.github/workflows/test_with_drupal.yaml

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+name: Test With Drupal
+
+on:
+    pull_request: null
+    push:
+        branches:
+            - master
+
+jobs:
+    test_with_drupal:
+        runs-on: ubuntu-latest
+        steps:
+            -   uses: actions/checkout@v2
+            -   uses: shivammathur/setup-php@v1
+                with:
+                    php-version: 7.3
+                    coverage: none # disable xdebug, pcov
+                    extensions: "intl"
+
+            # Run standalone install in non-root package, ref https://github.com/rectorphp/rector/issues/732
+            -   run: |
+                    # 1. install locally
+                    mkdir test-paths
+                    cd test-paths
+
+                    # Install latest Rector
+                    mkdir rector-dir
+                    # composer require rector/rector:@dev -d rector-dir --no-progress
+                    # composer require rector/rector:0.6.13 -d rector-dir --no-progress
+                    composer require palantirnet/drupal-rector:dev-rector-0.7 -d rector-dir --no-progress
+
+                    # Install Drupal
+                    mkdir drupal-dir
+                    composer create-project drupal/recommended-project drupal-dir --dev --no-progress
+
+                    # missing for some reason
+                    # composer require doctrine/doctrine-fixtures-bundle -d symfony-demo-dir --no-progress
+                    # composer dump-autoload --no-dev -d symfony-demo-dir
+
+                    # 2. run rector
+
+                    cd drupal-dir
+                    ../rector-dir/vendor/bin/rector process web/core/modules/aggregator/src/Plugin/views/row/Rss.php --dry-run --config ../../ci/config/rector-drupal.yaml

ci/config/rector-drupal.yaml

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+parameters:
+  autoload_paths:
+    - 'web/core'
+    - 'web/core/modules'
+    - 'web/modules'
+    - 'web/profiles'
+
+  file_extensions:
+    - module
+    - theme
+    - install
+    - profile
+    - inc
+    - engine