Add github workflow file

.github/workflows/ci.yaml

@@ -0,0 +1,79 @@
+name: CI
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  composer-validate:
+    name: "Validate using Composer"
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: 8.3
+          tools: composer:snapshot
+      - name: Validate
+        run: composer validate
+  windows-get-extension-matrix:
+    runs-on: ubuntu-latest
+    outputs:
+      matrix: ${{ steps.extension-matrix.outputs.matrix }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Get the extension matrix
+        id: extension-matrix
+        uses: php/php-windows-builder/extension-matrix@v1
+        with:
+          php-version-list: '8.0, 8.1, 8.2, 8.3, 8.4'
+  windows-phpt-tests:
+    needs: windows-get-extension-matrix
+    name: "Windows PHPT Tests"
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix: ${{fromJson(needs.windows-get-extension-matrix.outputs.matrix)}}
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Build and test the extension
+        uses: php/php-windows-builder/extension@v1
+        with:
+          php-version: ${{ matrix.php-version }}
+          ts: ${{ matrix.ts }}
+          arch: ${{ matrix.arch }}
+          run-tests: true
+  linux-phpt-tests:
+    name: "Linux PHPT Tests"
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: true
+      matrix:
+        os:
+          - ubuntu-22.04
+        php-version:
+          - 8.0
+          - 8.1
+          - 8.2
+          - 8.3
+          - 8.4
+        thread-safety:
+          - zts
+          - nts
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup PHP ${{ matrix.php-version }} ${{ matrix.thread-safety }}
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-version }}
+        env:
+          phpts: ${{ matrix.thread-safety }}
+          fail-fast: true
+      - name: Build
+        run: |
+          phpize
+          make
+      - name: Test
+        run: make test