Add GitHub Actions workflow for Docker image publishing

Author: magicpig

.github/workflows/update.yml

@@ -0,0 +1,43 @@
+name: Publish to Dockerhub
+
+on:
+  push:
+    tags:
+      - 'v*'
+  workflow_dispatch:
+    inputs:
+      tags:
+        description: 'Release Tags'
+
+jobs:
+  update_dockerhub:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out the repo
+        uses: actions/checkout@v3
+
+      - 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 Docker Hub
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_PASS }}
+
+      - name: Get latest tag
+        uses: "WyriHaximus/github-action-get-previous-tag@v1"
+        id: get-latest-tag
+        with:
+          fallback: latest
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v3
+        with:
+          push: true
+          tags: payment-demo:${{ github.event.inputs.tags || steps.get-latest-tag.outputs.tag }}
+          file: Dockerfile
+          platforms: linux/amd64,linux/arm64