Apply ansiblehost to inventory, fix syntax error

ec2.yml

@@ -5,6 +5,9 @@
   roles:
     - common
     - user
+- hosts: tag_ansiblehost_true
+  roles:
+    - ansiblehost
 - hosts: tag_role_nextcloud
   vars:
     mysql_root_password: !vault |

roles/ansiblehost/tasks/main.yml

@@ -2,6 +2,7 @@
 # vim:ft=ansible:
 ---
 - name: Set up system for Ansible
+  block:
   - name: Install Ansible-required packages via apt
     apt:
       name: "{{ packages }}"