chore: Add workflow to publish client to Docker Hub (#2)

.github/workflows/docker.yml

@@ -0,0 +1,35 @@
+name: Docker Publish
+
+# Prevent two instances of this workflow running at the same time
+concurrency: docker-publish
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: meyfa
+          password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: ./client
+          file: ./client/Dockerfile
+          push: true
+          tags:  meyfa/ddns-client:latest
+          cache-from: type=gha
+          cache-to: type=gha,mode=max

README.md

@@ -1 +1,7 @@
 # Dynamic DNS Using Cloudflare Workers
+
+[![CI](https://github.com/meyfa/ddns/actions/workflows/ci.yml/badge.svg)](https://github.com/meyfa/ddns/actions/workflows/ci.yml)
+
+## Client
+
+Available as a Docker image: https://hub.docker.com/r/meyfa/ddns-client