add github actions

Author: dcsg

.github/workflows/phpunit.yml

@@ -0,0 +1,70 @@
+name: "PHPUnit"
+
+on:
+    push:
+        paths-ignore:
+            - 'examples/**'
+    pull_request:
+        paths-ignore:
+            - 'examples/**'
+
+env:
+    COMPOSER_FLAGS: "--ansi --no-interaction --no-progress --prefer-dist"
+    SYMFONY_PHPUNIT_VERSION: ""
+
+jobs:
+    tests:
+        name: "PHPUnit"
+
+        runs-on: ubuntu-latest
+        continue-on-error: ${{ matrix.experimental }}
+
+        strategy:
+            matrix:
+                include:
+                    - php-version: "7.2"
+                      experimental: false
+                    - php-version: "7.4"
+                      experimental: false
+                    - php-version: "8.0"
+                      experimental: false
+                    - php-version: "8.1"
+                      experimental: false
+            fail-fast: false
+
+        steps:
+            - name: "Checkout"
+              uses: "actions/checkout@v3"
+
+            - name: "Install PHP"
+              uses: "shivammathur/setup-php@v2"
+              with:
+                  coverage: "none"
+                  extensions: "intl, zip"
+                  ini-values: "memory_limit=-1"
+                  php-version: "${{ matrix.php-version }}"
+
+            - name: "Determine composer cache directory"
+              id: "determine-composer-cache-directory"
+              run: "echo \"::set-output name=directory::$(composer config cache-dir)\""
+
+            - name: "Cache dependencies installed with composer"
+              uses: "actions/cache@v2"
+              with:
+                  path: "${{ steps.determine-composer-cache-directory.outputs.directory }}"
+                  key: "php-${{ matrix.php-version }}-symfony-php-unit-version-${{ env.SYMFONY_PHPUNIT_VERSION }}-${{ hashFiles('**/composer.lock') }}"
+                  restore-keys: "php-${{ matrix.php-version }}-symfony-php-unit-version-${{ env.SYMFONY_PHPUNIT_VERSION }}"
+
+            - name: "Install highest dependencies"
+              if: "matrix.experimental == true"
+              run: "composer config platform --unset && composer update ${{ env.COMPOSER_FLAGS }}"
+
+            - name: "Install locked dependencies"
+              if: "matrix.experimental == false"
+              run: "composer config platform --unset && composer update ${{ env.COMPOSER_FLAGS }}"
+
+            - name: "Initialize PHPUnit sources"
+              run: "vendor/bin/simple-phpunit --filter NO_TEST_JUST_AUTOLOAD_THANKS"
+
+            - name: "Run PHPUnit"
+              run: "composer phpunit"