default services conflit ?

old.vendor/composer/installers/.github/workflows/continuous-integration.yml

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+name: "Continuous Integration"
+
+on:
+  - push
+  - pull_request
+
+env:
+  COMPOSER_FLAGS: "--ansi --no-interaction --no-progress --prefer-dist"
+  SYMFONY_PHPUNIT_REMOVE_RETURN_TYPEHINT: "1"
+
+jobs:
+  tests:
+    name: "CI"
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        php-version:
+          - "5.3"
+          - "5.4"
+          - "5.5"
+          - "5.6"
+          - "7.0"
+          - "7.1"
+          - "7.2"
+          - "7.3"
+          - "7.4"
+          - "8.0"
+          - "8.1"
+        dependencies: [locked]
+        include:
+          - php-version: "5.3"
+            dependencies: lowest
+          - php-version: "8.1"
+            dependencies: lowest
+
+    steps:
+      - name: "Checkout"
+        uses: "actions/checkout@v2"
+
+      - name: "Install PHP"
+        uses: "shivammathur/setup-php@v2"
+        with:
+          coverage: "none"
+          php-version: "${{ matrix.php-version }}"
+          tools: composer:snapshot
+
+      - name: Get composer cache directory
+        id: composercache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+      - name: Cache dependencies
+        uses: actions/cache@v2
+        with:
+          path: ${{ steps.composercache.outputs.dir }}
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.json') }}
+          restore-keys: ${{ runner.os }}-composer-
+
+      - name: "Handle lowest dependencies update"
+        if: "contains(matrix.dependencies, 'lowest')"
+        run: "echo \"COMPOSER_FLAGS=$COMPOSER_FLAGS --prefer-lowest\" >> $GITHUB_ENV"
+
+      - name: "Upgrade phpunit-bridge if needed for php 8 lowest build"
+        if: "contains(matrix.php-version, '8.')"
+        run: |
+          composer require symfony/phpunit-bridge:^5.3.3 --dev --no-update
+
+      - name: "Install latest dependencies"
+        run: |
+          # Remove PHPStan as it requires a newer PHP
+          composer remove phpstan/phpstan phpstan/phpstan-phpunit --dev --no-update
+          composer update ${{ env.COMPOSER_FLAGS }}
+
+      - name: "Run tests"
+        run: "vendor/bin/simple-phpunit --verbose"

old.vendor/composer/installers/.github/workflows/lint.yml

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+name: "PHP Lint"
+
+on:
+  - push
+  - pull_request
+
+jobs:
+  tests:
+    name: "Lint"
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        php-version:
+          - "5.3"
+          - "8.0"
+
+    steps:
+      - name: "Checkout"
+        uses: "actions/checkout@v2"
+
+      - name: "Install PHP"
+        uses: "shivammathur/setup-php@v2"
+        with:
+          coverage: "none"
+          php-version: "${{ matrix.php-version }}"
+
+      - name: "Lint PHP files"
+        run: "find src/ -type f -name '*.php' -print0 | xargs -0 -L1 -P4 -- php -l -f"

old.vendor/composer/installers/.github/workflows/phpstan.yml

@@ -0,0 +1,51 @@
+name: "PHPStan"
+
+on:
+  - push
+  - pull_request
+
+env:
+  COMPOSER_FLAGS: "--ansi --no-interaction --no-progress --prefer-dist"
+  SYMFONY_PHPUNIT_VERSION: ""
+
+jobs:
+  tests:
+    name: "PHPStan"
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        php-version:
+          # pinned to 7.4 because we need PHPUnit 7.5 which does not support PHP 8
+          - "7.4"
+
+    steps:
+      - name: "Checkout"
+        uses: "actions/checkout@v2"
+
+      - name: "Install PHP"
+        uses: "shivammathur/setup-php@v2"
+        with:
+          coverage: "none"
+          php-version: "${{ matrix.php-version }}"
+
+      - name: Get composer cache directory
+        id: composercache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+      - name: Cache dependencies
+        uses: actions/cache@v2
+        with:
+          path: ${{ steps.composercache.outputs.dir }}
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.json') }}
+          restore-keys: ${{ runner.os }}-composer-
+
+      - name: "Install latest dependencies"
+        run: "composer update ${{ env.COMPOSER_FLAGS }}"
+
+      - name: Run PHPStan
+        # Locked to phpunit 7.5 here as newer ones have void return types which break inheritance
+        run: |
+          composer require --dev phpunit/phpunit:^7.5.20 --with-all-dependencies ${{ env.COMPOSER_FLAGS }}
+          vendor/bin/phpstan analyse