chore: add bc-check to CI (#1016)

Author: nikophil

.github/workflows/bc-check.yml

@@ -0,0 +1,40 @@
+name: "Backward Compatibility Check"
+
+on:
+  pull_request:
+    branches:
+      - "*.x"
+    paths:
+      - .github/workflows/bc-check.yml
+      - src/**
+  push:
+    branches:
+      - "*.x"
+    paths:
+      - .github/workflows/bc-check.yml
+      - src/**
+
+jobs:
+  roave_bc_check:
+    name: "Roave BC Check"
+    runs-on: "ubuntu-22.04"
+    steps:
+      - uses: "actions/checkout@v5"
+        with:
+          fetch-depth: 0
+
+      - name: Install dependencies
+        uses: ramsey/composer-install@v2
+        with:
+          composer-options: --prefer-dist
+
+      - name: Install PHP with extensions.
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: "8.4"
+
+      - name: Install roave/backward-compatibility-check.
+        run: composer bin bc-check require roave/backward-compatibility-check
+
+      - name: Run roave/backward-compatibility-check.
+        run: bin/tools/bc-check/vendor/roave/backward-compatibility-check/bin/roave-backward-compatibility-check --install-development-dependencies

.github/workflows/test-rector-rules.yml

@@ -31,8 +31,6 @@ jobs:
 
       - name: Install Rector & PHPStan
         run: |
-          composer update phpunit/phpunit:^11 brianium/paratest -W
-
           composer bin phpstan install
           composer bin rector install
 

.roave-backward-compatibility-check.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<roave-bc-check
+        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xsi:noNamespaceSchemaLocation="vendor/roave/backward-compatibility-check/resources/schema.xsd">
+    <baseline>
+        <ignored-regex>#\[BC\] SKIPPED: Roave\\BetterReflection\\Reflection\\ReflectionClass "Rector\\Rector\\AbstractRector" could not be found in the located source#</ignored-regex>
+        <ignored-regex>#\[BC\] SKIPPED: Roave\\BetterReflection\\Reflection\\ReflectionClass "Psalm\\Plugin\\PluginEntryPointInterface" could not be found in the located source#</ignored-regex>
+        <ignored-regex>#\[BC\] SKIPPED: Roave\\BetterReflection\\Reflection\\ReflectionClass "Psalm\\Plugin\\EventHandler\\AfterMethodCallAnalysisInterface" could not be found in the located source#</ignored-regex>
+    </baseline>
+</roave-bc-check>

bin/tools/bc-check/composer.json

@@ -0,0 +1,5 @@
+{
+    "require": {
+        "roave/backward-compatibility-check": "^8.15"
+    }
+}