Added a contrib/goproxy.yml Stackfile for Docker Swarm deployment using Traefik

contrib/README.md

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+# contrib
+
+## goproxy.yml
+
+A Docker Swarm mode Stackfile configured for the [Traefik](https://traefik.io)
+ingress controller ready to deploy in your swarm cluster.
+
+Deploy with:
+
+```#!bash
+docker stack deploy -c goproxy.yml
+```

contrib/goproxy.yml

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+version: "3.4"
+
+services:
+  goproxy:
+    image: goproxy/goproxy
+    volumes:
+      - goproxy:/go
+    networks:
+      - bridge
+      - traefik
+    deploy:
+      placement:
+        constraints:
+          - "node.hostname == dm1.mydomain.com"
+      labels:
+        - "traefik.enable=true"
+        - "traefik.port=8081"
+        - "traefik.backend=goproxy"
+        - "traefik.docker.network=traefik"
+        - "traefik.frontend.rule=Host:goproxy.mydomain.com"
+      replicas: 1
+
+networks:
+  bridge:
+    external: true
+  traefik:
+    external: true
+
+volumes:
+  goproxy:
+    driver: local