chore: Add GitHub Actions for Composer and update dependencies

Introduce PHP workflow for Composer tasks, including dependency updates, validation, and caching. Configure Dependabot for daily Composer updates. Update `composer.json` to require PHP 8.3 and newer versions of dependencies, and add a `.gitignore` file for common artifacts.

Author: efebagri

.github/dependabot.yml

@@ -0,0 +1,6 @@
+version: 2
+updates:
+  - package-ecosystem: composer
+    directory: /
+    schedule:
+      interval: daily

.github/workflows/php.yml

@@ -0,0 +1,32 @@
+name: PHP Composer
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Update Composer dependencies
+        run: composer update --no-interaction --no-progress
+
+      - name: Validate composer.json and composer.lock
+        run: composer validate --strict
+
+      - name: Cache Composer packages
+        id: composer-cache
+        uses: actions/cache@v3
+        with:
+          path: vendor
+          key: ${{ runner.os }}-php-${{ hashFiles('**/composer.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-php-
+
+      - name: Install dependencies
+        run: composer install --prefer-dist --no-progress

.gitignore

@@ -0,0 +1,3 @@
+vendor
+./composer.lock
+.idea

composer.json

@@ -14,7 +14,7 @@
     "license": "GPL-3.0-or-later",
     "authors": [
         {
-            "name": "Efe Bagri",
+            "name": "Efe Bağrı",
             "email": "[email protected]",
             "homepage": "https://www.exbil.net"
         }
@@ -24,12 +24,12 @@
         "source": "https://github.com/exbil/vpnresellers-php-api"
     },
     "require": {
-        "php": ">=7.2",
-        "guzzlehttp/guzzle": "^7.5",
+        "php": ">=8.3",
+        "guzzlehttp/guzzle": "^7.9.2",
         "ext-json": "*"
     },
     "require-dev": {
-        "phpunit/phpunit": "^9.5.0"
+        "phpunit/phpunit": "^12.0.10"
     },
     "autoload": {
         "psr-4": {