Add GHA workflow.

Author: jmalloc

.github/workflows/ci.yml

@@ -0,0 +1,32 @@
+name: CI
+on:
+  push:
+    branches:
+    - '*'
+  pull_request:
+  schedule:
+  - cron: 0 14 * * 0
+jobs:
+  ci:
+    name: PHP v${{ matrix.php }}
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        php: ['7.2', '7.3', '7.4']
+    steps:
+    - name: Set up PHP
+      uses: shivammathur/setup-php@master
+      with:
+        php-version: ${{ matrix.php }}
+        coverage: xdebug
+    - name: Check PHP version
+      run: php -v
+    - name: Checkout
+      uses: actions/checkout@v1
+    - name: Make
+      run: make ci
+    - name: Upload Coverage Reports
+      if: success()
+      run: |
+        [[ -z "${{ secrets.CODECOV_TOKEN }}" ]] || bash <(curl -s https://codecov.io/bash) -t "${{ secrets.CODECOV_TOKEN }}" -B "${{ github.ref }}"