Add support for --hostname

Author: andygrunwald

README.md

@@ -54,6 +54,7 @@ This will create:
 * `container_cap_drop` (default _{}_) - List of capabilities to drop
 * `container_network` (default _""_) - [Network settings](https://docs.docker.com/engine/reference/run/#network-settings)
 * `container_user` (default _""_) - [User settings](https://docs.docker.com/engine/reference/run/#user)
+* `container_hostname` (default _""_) - Container host name: `--hostname` flag
 * `container_devices` (default _[]_) - List of devices to add
 * `container_privileged` (default _false_) - Whether the container should be privileged
 * `container_start_post` - Optional command to be run by systemd after the container has started

defaults/main.yml

@@ -7,6 +7,7 @@ container_cmd: []
 container_host_network: false
 container_network: ""
 container_user: ""
+container_hostname: ""
 container_links: []
 container_ports: []
 container_volumes: []

templates/unit.j2

@@ -29,6 +29,7 @@ ExecStart={{ docker_path }} run \
   {% if container_host_network == true %}--network host {% else %}{{ params('--publish', container_ports) }}{% endif %}\
   {% if container_network %}--network {{ container_network }}{% endif %} \
   {% if container_user %}--user {{ container_user }}{% endif %} \
+  {% if container_hostname %}--hostname {{ container_hostname }}{% endif %} \
   {{ params('--link', container_links) }}\
   {{ params('--label', container_labels) }}\
   {{ params('--cap-add', container_cap_add) }}\