Introduce Github actions

Author: BitOne

.github/workflows/build.yaml

@@ -0,0 +1,43 @@
+name: Build the extension and test the analyzers
+
+on: push
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        php-versions: [5.6, 7.0, 7.1, 7.2, 7.3, 7.4]
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-versions }}
+          coverage: none
+
+      - name: Build the extension
+        run: |
+          cd extension/php*$(echo ${{ matrix.php-versions }} | cut -b 1)*/
+          phpize
+          ./configure
+          make
+
+      - name: Test the extension
+        run: |
+          cd extension/php*$(echo ${{ matrix.php-versions }} | cut -b 1)*/
+          REPORT_EXIT_STATUS=1 NO_INTERACTION=1 TEST_PHP_EXECUTABLE=$(which php) $(which php) run-tests.php -d extension=$PWD/modules/meminfo.so
+
+      - uses: actions/upload-artifact@v2
+        if: failure()
+        with:
+          name: ext-tests-output
+          path: 'extension/**/tests/*.out'
+
+      - name: Test the analyzers
+        run: |
+          cd analyzer
+          composer install
+          vendor/bin/phpspec run