Add test ci

.github/workflows/ci.yaml

@@ -0,0 +1,34 @@
+name: CI
+
+on: [push, pull_request]
+
+jobs:
+  build-test:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        php: ['7.4', '8.0']
+
+    name: PHP ${{ matrix.php }}
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+
+    - name: Install dependencies
+      uses: shivammathur/setup-php@v2
+      with:
+        php-version: ${{ matrix.php }}
+        extensions: exif
+
+    - name: Install PHP 7 dependencies
+      run: composer update --no-interaction --no-progress
+      if: "matrix.php < 8"
+
+    - name: Install PHP 8 dependencies
+      run: composer update --ignore-platform-req=php --no-interaction --no-progress
+      if: "matrix.php >= 8"
+
+    - name: Unit Tests
+      run: php ./vendor/bin/pest