feat: add 8.4.2

Author: akafeng

.github/workflows/push-8.4.yml

@@ -0,0 +1,34 @@
+name: Docker Build for PHP 8.4
+
+on:
+  push:
+    branches:
+      - 'main'
+    paths:
+      - 'Dockerfile-8.4'
+      - 'docker-*'
+
+env:
+  VERSION: '8.4'
+
+jobs:
+  build:
+    name: Build Testing
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Build and cache
+        uses: docker/build-push-action@v6
+        with:
+          file: Dockerfile-${{ env.VERSION }}
+          target: builder
+          platforms: |
+            linux/amd64
+            linux/arm64/v8
+          cache-to: type=gha, scope=php-${{ env.VERSION }}, mode=max
+          outputs: type=cacheonly