start setting up Actions for builds

.github/workflows/build.yml

@@ -0,0 +1,46 @@
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ${{ matrix.operating-system }}
+    strategy:
+      fail-fast: false
+      matrix:
+        operating-system: [ ubuntu-latest ]
+        php: [ '5.4', '5.5', '5.6', '7.0', '7.1', '7.2', '7.3', '7.4', '8.0' ]
+        dependencies: [ 'locked' ]
+
+    name: PHP ${{ matrix.php }} on ${{ matrix.operating-system }} with ${{ matrix.dependencies }} dependencies
+
+    steps:
+      - uses: actions/checkout@v2
+        name: Checkout repository
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+
+      - uses: ramsey/composer-install@v1
+        with:
+          dependency-versions: ${{ matrix.dependencies }}
+
+      - name: Install PEAR
+        run: |
+          sudo apt-get install php-pear
+          pear list
+          sudo pear channel-update pear
+          sudo pear upgrade -f pear
+          sudo pear install text_diff
+          pear list
+          sh scripts/pear.sh config-set umask 0022
+          sudo sh scripts/pear.sh config-set umask 0022 system
+
+      - name: Run tests
+        run: |
+          umask 0022
+          sudo sh scripts/pear.sh run-tests -q -d -r tests