Add GitHub Actions workflow for Docker build and push

Author: isaric

.github/workflows/docker

@@ -0,0 +1,33 @@
+name: Build and Push Docker Image
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to DockerHub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_PAT }}
+
+      - name: Build and push Docker image (multi-arch)
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: true
+          tags: isaricpv/influxdb-summary-java:latest
+          platforms: linux/amd64,linux/arm64