feat(hostname): support partial execution with prepare and deploy tags

roles/hostname/tasks/main.yml

@@ -8,6 +8,7 @@
     mode: 0644
     content: |
       {{ hostname_fqdn }}
+  tags: [ 'deploy', 'deploy-hostname' ]
 
 - name: Ensure /etc/hosts contains all hostnames and aliases of the server
   blockinfile:
@@ -20,6 +21,7 @@
       {{ host.ip }}	{{ host.fqdn }}		{{ host.alias | default([]) | join(" ") }}
       {% endfor %}
     marker: "# {mark} ANSIBLE MANAGED BLOCK"
+  tags: [ 'deploy', 'deploy-hostname' ]
 
 # Needed because ansibles `ansible_fqdn` is loaded
 # from /etc/hostname, not from the running hostname
@@ -28,6 +30,7 @@
     cmd: "hostname"
   changed_when: false
   register: current_hostname
+  tags: [ 'deploy', 'deploy-hostname' ]
 
 - name: Set hostname via hostnamectl to avoid a reboot
   command:
@@ -35,3 +38,4 @@
   when: hostname_fqdn != hostname_current
   vars:
     hostname_current: "{{ current_hostname.stdout }}."
+  tags: [ 'deploy', 'deploy-hostname' ]