adding github action to build and publish docker image

.github/workflows/publish-docker-image.yaml

@@ -0,0 +1,25 @@
+name: ci
+
+on:
+  push:
+    tags:
+      - '*'
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up Docker Buildx
+      - uses: docker/setup-buildx-action@v3
+
+      - name: Login to Docker Hub
+      - uses: docker/login-action@v3
+      - with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Build and push
+      - uses: docker/build-push-action@v6
+      - with:
+          push: true
+          tags: wshaddix/http-nats-proxy:${{github.ref_name}}