ci(legacy): catch syntax errors on older php versions

.github/workflows/legacy.yml

@@ -22,11 +22,20 @@ concurrency:
 jobs:
   lint:
     runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - php-version: "7.2" # Bionic
+          - php-version: "7.3" # Buster
+          - php-version: "7.4" # Bullseye, Focal
+
     steps:
       - uses: actions/checkout@v3
       - uses: shivammathur/setup-php@v2
         with:
-          php-version: 7.4
+          php-version: ${{ matrix.php-version }}
+
       - name: Lint
         run: make lint
         working-directory: legacy

legacy/.gitignore

@@ -9,6 +9,7 @@
 /tests/test_results.xml
 
 # Tools
+/tools/composer.lock
 /tools/vendor/
 .php-cs-fixer.cache
 

legacy/Makefile

@@ -25,7 +25,7 @@ format: tools
 
 .PHONY: lint
 lint: tools
-	$(TOOLS)/bin/php-cs-fixer fix --dry-run --diff
+	$(TOOLS)/bin/php-cs-fixer fix --verbose --dry-run --diff
 
 .PHONY: build
 build:

legacy/tools/composer.json

@@ -1,5 +1,5 @@
 {
   "require": {
-    "friendsofphp/php-cs-fixer": "~3.8.0"
+    "friendsofphp/php-cs-fixer": ">=3.4.0 <3.9.0"
   }
 }