Add caddy reverse proxy role

Acts as reverse proxy for the docker instance. Can be configured through
docker labels. Proxies anything that is received on port 80 or 443.

ansible/roles/caddy/templates/docker-compose.yaml.j2

@@ -0,0 +1,30 @@
+services:
+  caddy:
+    image: lucaslorentz/caddy-docker-proxy:ci-alpine
+    ports:
+      - 80:80
+      - 443:443
+    networks:
+      - caddy
+    volumes:
+      - /var/run/docker.sock:/var/run/docker.sock
+      - caddy_data:/caddy
+    labels:
+      caddy.auto_https: "off"
+
+  whoami:
+    container_name: whoami
+    image: traefik/whoami
+    networks:
+      - caddy
+    labels:
+      caddy: "http://test.pichi.berlin"
+      caddy.reverse_proxy: "{{ '{{' }}upstreams 80{{ '}}'}}" # has to be done to prevent ansible templating
+
+networks:
+  caddy:
+    external: true
+
+volumes:
+  caddy_data: {}
+