add github actions

Author: Tobion

.gitattributes

@@ -1,5 +1,6 @@
-/tests export-ignore
-.editorconfig export-ignore
-.gitattributes export-ignore
-.gitignore export-ignore
-phpunit.xml export-ignore
+/.github/ export-ignore
+/tests/ export-ignore
+/.editorconfig export-ignore
+/.gitattributes export-ignore
+/.gitignore export-ignore
+/phpunit.xml export-ignore

.github/workflows/checks.yml

@@ -0,0 +1,26 @@
+name: Checks
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+jobs:
+  composer-normalize:
+    name: Composer Normalize
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Install
+        uses: docker://composer
+        with:
+          args: install
+
+      - name: Normalize
+        uses: docker://composer
+        with:
+          args: composer normalize --dry-run

.github/workflows/ci.yml

@@ -0,0 +1,52 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+jobs:
+  build-lowest-version:
+    name: Build lowest version
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Set up PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: '7.2'
+          coverage: 'none'
+
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Install dependencies
+        run: composer update --no-interaction --prefer-stable --prefer-lowest --no-progress --prefer-dist
+
+      - name: Run tests
+        run: vendor/bin/simple-phpunit
+
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    strategy:
+      max-parallel: 10
+      matrix:
+        php: ['7.2', '7.3', '7.4', '8.0']
+
+    steps:
+      - name: Set up PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          coverage: 'none'
+
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Install dependencies
+        run: composer update --no-interaction --no-progress --prefer-dist
+
+      - name: Run tests
+        run: vendor/bin/simple-phpunit