Add workflow

.github/workflows/build.yml

@@ -0,0 +1,39 @@
+name: test
+on: [push]
+jobs:
+  run:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        php:
+          - 8.0
+          - 7.4
+          - 7.3
+          - 7.2
+          - 7.1
+          - 7.0
+          - 5.6
+    name: PHP ${{ matrix.php }} Build on ${{ matrix.os }}
+    env:
+      PHP_CS_FIXER_IGNORE_ENV: 1
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          ssh-key: ${{ secrets.DEPLOY_KEY }}
+
+      - name: Setup PHP ${{ matrix.php }}
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          extensions: mbstring, intl, sockets, gmp, curl, xml, json
+          coverage: none
+          ini-values: phar.readonly=0
+
+      - name: Wait for packagist
+        run: |
+          tests/waitPackagist.php
+
+      - name: Build
+        run: |
+          tests/makephar.sh