chore: add static analysis (PHPCS + PHPStan) and CI

.github/workflows/php-lint.yml

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+name: PHP Lint
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  php-matrix:
+    name: PHP matrix
+    runs-on: ubuntu-latest
+    outputs:
+      versions: ${{ steps.php-matrix.outputs.versions }}
+    steps:
+      - uses: actions/checkout@v5
+
+      - uses: typisttech/php-matrix-action@v3
+        id: php-matrix
+
+  php-lint:
+    name: PHP Lint (PHP ${{ matrix.php }})
+    needs: php-matrix
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        php: ${{ fromJSON(needs.php-matrix.outputs.versions) }}
+    steps:
+      - uses: actions/checkout@v5
+
+      - uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          coverage: none
+          tools: composer
+
+      - uses: ramsey/composer-install@v3
+
+      - run: composer lint

.github/workflows/phpcs.yml

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+name: PHPCS
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  php-matrix:
+    name: PHP matrix
+    runs-on: ubuntu-latest
+    outputs:
+      versions: ${{ steps.php-matrix.outputs.versions }}
+    steps:
+      - uses: actions/checkout@v5
+
+      - uses: typisttech/php-matrix-action@v3
+        id: php-matrix
+
+  phpcs:
+    name: PHPCS (PHP ${{ matrix.php }})
+    needs: php-matrix
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        php: ${{ fromJSON(needs.php-matrix.outputs.versions) }}
+    steps:
+      - uses: actions/checkout@v5
+
+      - uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          coverage: none
+          tools: composer
+
+      - uses: ramsey/composer-install@v3
+
+      - run: composer cs

.github/workflows/phpstan.yml

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+name: PHPStan
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  php-matrix:
+    name: PHP matrix
+    runs-on: ubuntu-latest
+    outputs:
+      versions: ${{ steps.php-matrix.outputs.versions }}
+    steps:
+      - uses: actions/checkout@v5
+
+      - uses: typisttech/php-matrix-action@v3
+        id: php-matrix
+
+  phpstan:
+    name: PHPStan (PHP ${{ matrix.php }})
+    needs: php-matrix
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        php: ${{ fromJSON(needs.php-matrix.outputs.versions) }}
+    steps:
+      - uses: actions/checkout@v5
+
+      - uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          coverage: none
+          tools: composer
+
+      - uses: ramsey/composer-install@v3
+
+      - run: composer stan

.gitignore

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+/vendor/

composer.json

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+{
+    "name": "libresign/libresign-wp-customizations",
+    "description": "WordPress customizations for libresign.coop",
+    "type": "wordpress-plugin",
+    "license": "GPL-2.0-or-later",
+    "require": {
+        "php": ">=8.3 <8.6"
+    },
+    "require-dev": {
+        "dealerdirect/phpcodesniffer-composer-installer": "^1.0",
+        "php-parallel-lint/php-parallel-lint": "^1.4",
+        "php-stubs/woocommerce-stubs": "^9.0",
+        "phpcompatibility/phpcompatibility-wp": "^2.1",
+        "phpstan/phpstan": "^2.1",
+        "squizlabs/php_codesniffer": "^3.13",
+        "szepeviktor/phpstan-wordpress": "^2.0",
+        "wp-coding-standards/wpcs": "^3.2"
+    },
+    "config": {
+        "allow-plugins": {
+            "dealerdirect/phpcodesniffer-composer-installer": true
+        }
+    },
+    "scripts": {
+        "lint": "parallel-lint --exclude vendor .",
+        "cs": "phpcs",
+        "cs:fix": "phpcbf",
+        "stan": "phpstan analyse",
+        "ci": [
+            "@lint",
+            "@cs",
+            "@stan"
+        ]
+    }
+}