ops/openstack: add host aggregates playbook (#225)

Signed-off-by: Christian Berendt <berendt@osism.tech>

docs/guides/operations-guide/openstack/day2-operations/playbooks.md

@@ -0,0 +1,38 @@
+---
+sidebar_label: Playbooks
+sidebar_position: 40
+---
+
+# Playbooks
+
+## Host aggregates
+
+Host aggregates can be managed with the playbook. The playbook is used with
+`osism apply -e openstack host-aggregates`.
+
+Further arguments for host aggregates can be found in the
+[documentation for the openstack.cloud.host_aggregate](https://docs.ansible.com/ansible/latest/collections/openstack/cloud/host_aggregate_module.html) Ansible module.
+
+```yaml title="environments/openstack/playbook-host-aggregates.yml"
+---
+- name: Manage host aggregates
+  hosts: localhost
+  connection: local
+
+  vars:
+    host_aggregates:
+      - name: aggregate1
+        hosts:
+          - host1
+          - host2
+          - host3
+
+  tasks:
+    - name: Create host aggregate
+      openstack.cloud.host_aggregate:
+        cloud: admin
+        state: present
+        name: "{{ item.name }}"
+        hosts: "{{ item.hosts }}"
+      loop: "{{ host_aggregates }}"
+```

docs/guides/other-guides/style-guide.md

@@ -8,7 +8,7 @@ sidebar_position: 100
 ## Ansible
 
 We implement all the default rules of Ansible Lint. All default rules can be found in the
-Ansible Lint documentation: <https://ansible.readthedocs.io/projects/lint/rules/>
+[Ansible Lint documentation](https://ansible.readthedocs.io/projects/lint/rules/).
 
 ### Task names