add Docker CI workflow for multiple PHP versions

Author: hogyesn

.github/workflows/docker-image.yml

@@ -0,0 +1,42 @@
+name: Docker Image CI
+
+on:
+  push:
+    branches:
+      - develop
+
+jobs:
+
+  build:
+
+    runs-on: ubuntu-latest
+    
+    strategy:
+      matrix:
+        version:
+          - "8.0.30"
+          - "8.1.34"
+          - "8.2.30"
+          - "8.3.29"
+          - "8.4.16"
+          - "8.5.1"
+
+    steps:
+    - uses: actions/checkout@v4
+    
+    - uses: docker/setup-buildx-action@v3
+
+    - uses: docker/login-action@v3
+      with:
+        username: ${{ secrets.DOCKERHUB_USERNAME }}
+        password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+    - name: Build and push
+      uses: docker/build-push-action@v5
+      with:
+        context: .
+        push: true
+        build-args: |
+          PHP_VERSION=${{ matrix.version }}
+        tags: |
+          ${{ secrets.DOCKERHUB_USERNAME }}/php-extension-dev:${{ matrix.version }}