Allow custom line separator in CSVArray::toCSV() (#11)

* Allow custom line separator in `CSVArray::toCSV()`

* Update CI

.github/CONTRIBUTING.md

@@ -2,7 +2,7 @@
 
 We are using [GitHub Actions](https://github.com/features/actions) as a continuous integration system.
 
-For details, see [`workflows/continuous-integration.yml`](workflows/continuous-integration.yml).
+For details, see [`workflows`](workflows).
 
 ## Code Style
 

.github/workflows/format.yml

@@ -0,0 +1,52 @@
+# https://help.github.com/en/categories/automating-your-workflow-with-github-actions
+
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+
+jobs:
+  composer-normalize:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: ${{ github.head_ref }}
+
+      - uses: shivammathur/setup-php@v2
+        with:
+          coverage: none
+          extensions: mbstring
+          php-version: 8.3
+
+      - run: composer install --no-interaction --no-progress --no-suggest
+
+      - run: composer normalize
+
+      - uses: stefanzweifel/git-auto-commit-action@v4
+        with:
+          commit_message: Normalize composer.json
+
+  php-cs-fixer:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: ${{ github.head_ref }}
+
+      - uses: shivammathur/setup-php@v2
+        with:
+          coverage: none
+          extensions: mbstring
+          php-version: 8.3
+
+      - run: composer install --no-interaction --no-progress --no-suggest
+
+      - run: vendor/bin/php-cs-fixer fix
+
+      - uses: stefanzweifel/git-auto-commit-action@v4
+        with:
+          commit_message: Apply php-cs-fixer changes

.github/workflows/validate.yml

@@ -0,0 +1,121 @@
+# https://help.github.com/en/categories/automating-your-workflow-with-github-actions
+
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+
+jobs:
+  composer-validate:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: shivammathur/setup-php@v2
+        with:
+          coverage: none
+          extensions: mbstring
+          php-version: 8.3
+
+      - run: composer validate --strict
+
+  static-code-analysis:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: shivammathur/setup-php@v2
+        with:
+          coverage: none
+          extensions: mbstring
+          php-version: 8.3
+
+      - run: composer install --no-interaction --no-progress --no-suggest
+
+      - run: vendor/bin/phpstan analyse
+
+  tests:
+    name: "Tests - PHP ${{ matrix.php-version }}, Illuminate ${{ matrix.illuminate }}, ${{ matrix.dependencies }}"
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        php-version:
+          - "7.4"
+          - "8.0"
+          - "8.1"
+          - "8.2"
+          - "8.3"
+
+        dependencies:
+          - lowest
+          - highest
+
+        illuminate:
+          - ^8.73
+          - ^9
+          - ^10
+        exclude:
+          - php-version: "7.4"
+            illuminate: ^9
+          - php-version: "7.4"
+            illuminate: ^10
+          - php-version: "8.0"
+            illuminate: ^10
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: shivammathur/setup-php@v2
+        with:
+          coverage: none
+          extensions: mbstring
+          php-version: "${{ matrix.php-version }}"
+
+      - run: composer require "illuminate/support:${{ matrix.illuminate }}" --no-interaction --no-update
+
+      - if: matrix.dependencies == 'lowest'
+        run: composer update --prefer-lowest --no-interaction --no-progress --no-suggest
+
+      - if: matrix.dependencies == 'highest'
+        run: composer update --no-interaction --no-progress --no-suggest
+
+      - run: vendor/bin/phpunit
+
+  code-coverage:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: shivammathur/setup-php@v2
+        with:
+          coverage: pcov
+          extensions: mbstring
+          php-version: 8.3
+
+      - run: composer install --no-interaction --no-progress --no-suggest
+
+      - run: vendor/bin/phpunit --coverage-clover=.build/logs/clover.xml
+
+      - uses: codecov/codecov-action@v3
+
+  mutation-tests:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: shivammathur/setup-php@v2
+        with:
+          coverage: pcov
+          extensions: mbstring
+          php-version: 8.3
+
+      - run: composer install --no-interaction --no-progress --no-suggest
+
+      - run: vendor/bin/infection --ignore-msi-with-no-mutations --min-covered-msi=60 --min-msi=60