Move downgrade logic into its own file

Author: Bellangelo

.github/actions/downgrade/action.yml

@@ -0,0 +1,21 @@
+name: Downgrade PHP 8.3 to PHP 7.4
+
+runs:
+  using: composite
+
+  steps:
+    -   uses: actions/checkout@v2
+
+    -   uses: shivammathur/setup-php@v2
+        with:
+          php-version: 8.3
+          coverage: none
+
+    -   uses: ramsey/composer-install@v2
+
+    # downgrade /src to PHP 7.4
+    -   run: vendor/bin/rector process src bin --config build/rector-downgrade-php-74.php --ansi
+
+    # copy PHP 7.4 composer
+    -   run: cp build/composer-php-74.json composer.json
+    -   run: cp build/composer-php-74.lock composer.lock

.github/workflows/downgrade-release.yml

@@ -10,21 +10,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      -   uses: actions/checkout@v2
-
-      -   uses: shivammathur/setup-php@v2
-          with:
-            php-version: 8.3
-            coverage: none
-
-      -   uses: ramsey/composer-install@v2
-
-      # downgrade /src to PHP 7.4
-      -   run: vendor/bin/rector process src bin --config build/rector-downgrade-php-74.php --ansi
-
-      # copy PHP 7.4 composer
-      -   run: cp build/composer-php-74.json composer.json
-      -   run: cp build/composer-php-74.lock composer.lock
+      -   uses: ./.github/actions/downgrade
 
       # clear the dev files
       -   run: find . ! -name 'bin' ! -name 'src' ! -name 'vendor' ! -name 'composer.json' ! -name 'composer.lock' ! -name 'README.md' -mindepth 1 -delete