WIP: add acmebot role

Implements configuration of the acmebot package we built. Some TODOs and testing left.

.ansible-lint

+parseable: true
+quiet: true
+use_default_rules: true
+skip_list:
+  - '204'  # line length is checked by yamllint
+  - '401'  # git checkout must contain explicit version
+  - '701'  # 7xx is about ansible galaxy guidelines
+  - '702'
+  - '703'