Fix wget healthchecks to not use localhost

For a reason, current wget versions error out when using localhost instead
of 127.0.0.1 as the healthcheck for docker services. Probably has something
to do with dns resolution - either on docker or wget end, but have not
looked to deep into it.

roles/caddy/templates/docker-stack.yml.j2

@@ -5,7 +5,7 @@ services:
     image: caddy:{{ caddy_version }}
     command: caddy run --config /etc/caddy/config.json
     healthcheck:
-        test: ["CMD", "wget", "--quiet", "--spider", "--tries=1", "http://localhost:2019/metrics"]
+        test: ["CMD", "wget", "--quiet", "--spider", "--tries=1", "http://127.0.0.1:2019/metrics"]
         interval: 1m
         timeout: 10s
         retries: 3