gluebuddy: Add gitlab project bot for the alpm project

This will be used for issue-bot[1] similar as it is done in the
signstar project[2].

[1] archlinux/signstar#20 (comment 201743)
[2] https://gitlab.com/gitlab-org/distribution/issue-bot

roles/gluebuddy/defaults/main.yml

@@ -11,3 +11,4 @@ gitlab_bots:
   - group_11323_bot_c1f9e22ef6391b32e45f7e4a135ecc91
   - project_16_bot_32e6f4728202b8f9259313830e9e5a18
   - project_32147_bot_17ab98ea29bb8d2f93c685af009e3376
+  - project_84858_bot_e982c0734ca839275298899e49ed1f51