add GitHub Actions jobs

Author: deminy

.github/workflows/config.yml

@@ -0,0 +1,24 @@
+name: Build and Test
+on: [push, pull_request]
+jobs:
+  ubuntu:
+    strategy:
+      matrix:
+          version: ["7.4", "8.0", "8.1", "8.2"]
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout php-bsdiff
+        uses: actions/checkout@v2
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{matrix.version}}
+      - name: phpize
+        run: phpize
+      - name: configure
+        run: ./configure
+      - name: make
+        run: make
+      - name: test
+        run: |
+            make test TESTS="--show-diff tests"