Add OIDC GitHub Actions suport

Author: glaubinix

.gitattributes

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+.gitattributes     export-ignore
+/.github/          export-ignore
+.gitignore         export-ignore
+/phpunit.xml.dist  export-ignore
+/phpstan.dist.neon export-ignore
+/bin/              export-ignore
+/tests/            export-ignore

.github/workflows/continuous-integration.yml

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+name: CI
+on:
+  pull_request:
+  push:
+    branches:
+      - "main"
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        php-version:
+          - "7.2"
+          - "7.3"
+          - "7.4"
+          - "8.0"
+          - "8.1"
+          - "8.2"
+          - "8.3"
+          - "8.4"
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: "Install PHP"
+        uses: "shivammathur/setup-php@v2"
+        with:
+          coverage: "none"
+          ini-values: "memory_limit=-1, phar.readonly=0"
+          php-version: "${{ matrix.php-version }}"
+
+      - name: Validate composer.json
+        run: composer validate
+
+      - name: Install dependencies
+        run: composer install --prefer-dist --no-progress
+
+      - name: PHPUnit
+        run: ./vendor/bin/phpunit tests
+
+      - name: PHP-CS-Fixer
+        run: ./vendor/bin/php-cs-fixer fix --dry-run --diff
+        env:
+          PHP_CS_FIXER_IGNORE_ENV: 1
+
+      - name: PHPStan
+        run: ./vendor/bin/phpstan analyze --no-progress

.gitignore

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+.php-cs-fixer.cache
+vendor

.php-cs-fixer.php

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+<?php
+
+$header = <<<HEADER
+(c) Packagist Conductors GmbH <[email protected]>
+
+For the full copyright and license information, please view the LICENSE
+file that was distributed with this source code.
+HEADER;
+
+$finder = PhpCsFixer\Finder::create()
+    ->files()
+    ->in(__DIR__.'/src')
+    ->in(__DIR__.'/tests')
+    ->name('*.php')
+;
+
+return (new PhpCsFixer\Config())
+    ->setUsingCache(true)
+    ->setRiskyAllowed(true)
+    ->setRules(array(
+        '@PSR2' => true,
+        'no_unused_imports' => true,
+        'header_comment' => [
+            'comment_type' => 'PHPDoc',
+            'header' => $header,
+            'location' => 'after_declare_strict',
+            'separate' => 'both',
+        ]
+    ))
+    ->setFinder($finder)
+    ;

README.md

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+# packagist/publish-artifact-github-action
+
+GitHub Action to publish artifacts as package versions to Private Packagist.
+
+## Requirements
+
+PHP >= 7.2
+
+## Install
+
+Via Composer:
+```bash
+$ composer require private-packagist/oidc-identities
+```
+
+## Usage
+
+Initiate a `TokenGenerator` instance and call the `generate` method with `$audience`.
+The `TokenGenerator` will automatically try all supported platforms.
+
+```php
+// Configure a HttpMethodsClient instance
+$oidcHttpClient = new HttpMethodsClient(
+    Psr18ClientDiscovery::find(),
+    Psr17FactoryDiscovery::findRequestFactory(),
+    Psr17FactoryDiscovery::findStreamFactory(),
+);
+
+$tokenGenerator = new TokenGenerator(new NullLogger(), $oidcHttpClient);
+$token = $tokenGenerator->generate($audience);
+```
+
+## Copyright and License
+
+The  GitHub Action is licensed under the MIT License.

composer.json

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+{
+    "name": "private-packagist/oidc-identities",
+    "description": "Create OIDC tokens on different platforms",
+    "license": "MIT",
+    "keywords": ["openid connect", "oidc", "identities"],
+    "autoload": {
+        "psr-4": {
+            "PrivatePackagist\\OIDC\\Identities\\": "src/"
+        }
+    },
+    "autoload-dev": {
+        "psr-4": {
+            "PrivatePackagist\\OIDC\\Identities\\": "tests/"
+        }
+    },
+    "require": {
+        "php": "^7.2.5 || ^8.0",
+        "psr/log": "^1.0 || ^2.0 || ^3.0",
+        "php-http/client-common": "^1.9 || ^2.7"
+    },
+    "require-dev": {
+        "phpstan/phpstan": "^1.11.8",
+        "phpstan/phpstan-phpunit": "^1.4.0",
+        "phpstan/phpstan-deprecation-rules": "^1.2.0",
+        "phpstan/phpstan-strict-rules": "^1.6.0",
+        "phpunit/phpunit": "^8.5",
+        "php-http/mock-client": "^1.6",
+        "nyholm/psr7": "^1.8",
+        "symfony/http-client": "^5.4",
+        "monolog/monolog": "^2",
+        "friendsofphp/php-cs-fixer": "^3.4",
+        "phpstan/extension-installer": "^1.4"
+    },
+    "config": {
+        "allow-plugins": {
+            "php-http/discovery": true,
+            "phpstan/extension-installer": true
+        },
+        "platform": {
+            "php": "7.2.5"
+        }
+    }
+}