Replace Travis CI tests with Github action

Author: Kovah

.github/workflows/test.yml

@@ -0,0 +1,35 @@
+name: Tests
+
+on: [push, pull_request]
+
+jobs:
+    build:
+        runs-on: ubuntu-latest
+
+        strategy:
+            matrix:
+                php-version: ['8.0', '8.1', '8.2']
+                composer-flags: ["--prefer-lowest", ""]
+
+        steps:
+            - name: Checkout
+              uses: actions/checkout@v2
+
+            - name: Setup PHP
+              uses: shivammathur/setup-php@v2
+              with:
+                  php-version: ${{ matrix.php-version }}
+                  coverage: pcov
+
+            - name: Install dependencies
+              run: |
+                  composer self-update
+                  composer update ${{ matrix.composer-flags }} --no-interaction --prefer-source
+
+            - name: Run tests
+              run: ./vendor/bin/phpunit --coverage-text --coverage-clover=coverage.clover
+
+            - name: Upload coverage to Scrutinizer
+              run: |
+                  wget https://scrutinizer-ci.com/ocular.phar
+                  php ocular.phar code-coverage:upload --format=php-clover coverage.clover

.travis.yml

@@ -2,7 +2,7 @@
 
 [![Latest Version on Packagist](https://img.shields.io/packagist/v/laravel-notification-channels/pushover.svg?style=flat-square)](https://packagist.org/packages/laravel-notification-channels/pushover)
 [![Software License](https://img.shields.io/badge/license-MIT-brightgreen.svg?style=flat-square)](LICENSE.md)
-[![Build Status](https://img.shields.io/travis/laravel-notification-channels/pushover/master.svg?style=flat-square)](https://travis-ci.org/laravel-notification-channels/pushover)
+[![Build Status](https://img.shields.io/github/actions/workflow/status/laravel-notification-channels/pushover/tests.yml?style=flat-square)](https://github.com/laravel-notification-channels/pushover/actions)
 [![StyleCI](https://styleci.io/repos/65543497/shield)](https://styleci.io/repos/65543497)
 [![Quality Score](https://img.shields.io/scrutinizer/g/laravel-notification-channels/pushover.svg?style=flat-square)](https://scrutinizer-ci.com/g/laravel-notification-channels/pushover)
 [![Code Coverage](https://img.shields.io/scrutinizer/coverage/g/laravel-notification-channels/pushover/master.svg?style=flat-square)](https://scrutinizer-ci.com/g/laravel-notification-channels/pushover/?branch=master)