Added bugbot signed tag

Signed-off-by: Morten Linderud <morten@linderud.pw>

roles/bugbot/defaults/main.yml

@@ -2,6 +2,7 @@
 irc_host: 'chat.freenode.net'
 irc_port: '6697'
 irc_channel: '#archlinux-bugs'
+bugbot_version: 20200630
 bugbot_admins:
   - keenerd
   - falconindy

roles/bugbot/tasks/main.yml

@@ -7,6 +7,9 @@
   git:
     repo: https://gitlab.archlinux.org/archlinux/bugbot.git
     dest: /srv/bugbot
+    force: true
+    verify_commit: true
+    version: "{{ bugbot_version }}"
 
 - name: install env file
   template: src=bugbot.j2 dest=/srv/bugbot/env owner=root group=root mode=0600