Update Docker CI workflow for multi-branch support

Author: JamesDAdams

.github/workflows/docker-image.yml

@@ -0,0 +1,64 @@
+name: Build and Push Docker Image
+
+on:
+  push:
+    branches: [ main, master ]
+    paths:
+      - 'docker/**'
+      - '.github/workflows/docker-build.yml'
+  pull_request:
+    branches: [ main, master ]
+    paths:
+      - 'docker/**'
+  workflow_dispatch:
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+    
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v3
+    
+    - name: Log in to Docker Hub
+      if: github.event_name != 'pull_request'
+      uses: docker/login-action@v3
+      with:
+        username: ${{ secrets.DOCKER_USERNAME }}
+        password: ${{ secrets.DOCKER_PASSWORD }}
+    
+    - name: Log in to GitHub Container Registry
+      if: github.event_name != 'pull_request'
+      uses: docker/login-action@v3
+      with:
+        registry: ghcr.io
+        username: ${{ github.actor }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+    
+    - name: Extract metadata
+      id: meta
+      uses: docker/metadata-action@v5
+      with:
+        images: |
+          ${{ github.repository }}/wan-ip-checker
+          ghcr.io/${{ github.repository }}/wan-ip-checker
+        tags: |
+          type=ref,event=branch
+          type=ref,event=pr
+          type=raw,value=latest,enable={{is_default_branch}}
+          type=sha
+    
+    - name: Build and push Docker image
+      uses: docker/build-push-action@v5
+      with:
+        context: ./docker
+        file: ./docker/Dockerfile
+        push: ${{ github.event_name != 'pull_request' }}
+        tags: ${{ steps.meta.outputs.tags }}
+        labels: ${{ steps.meta.outputs.labels }}
+        platforms: linux/amd64,linux/arm64
+        cache-from: type=gha
+        cache-to: type=gha,mode=max