feat: add hostname for a service

CHANGELOG.md

@@ -4,4 +4,5 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 Which is based on [Keep A Changelog](http://keepachangelog.com/)
 
 ## [Unreleased]
+
 - first version

tasks/config.yml

@@ -29,6 +29,7 @@
     name: '{{ item.key }}'
     image: '{{ item.value.image }}'
     command: '{{ item.value.command|default([]) }}'
+    hostname: '{{ item.value.hostname|default(omit) }}'
     args: '{{ item.value.args|default([]) }}'
     mounts: '{{ item.value.mounts|default([]) }}'
     networks: '{{ item.value.networks|default([]) }}'