Add frontend role and applications playbook

ansible/applications.yaml

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+---
+- name: Set up domain
+  hosts: frontend
+  remote_user: "{{ ssh_user }}"
+  roles:
+    - frontend

ansible/inventories/applications.example

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+[frontend]
+user.uber.space ansible_python_interpreter=/usr/bin/python

ansible/roles/frontend/tasks/domains.yaml

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+---
+- name: List domains
+  ansible.builtin.command: uberspace web domain list
+  changed_when: false
+  register: domains
+- name: Set up domain
+  when: domains.stdout.find(frontend_domain) == -1
+  block:
+    - name: Add domain
+      ansible.builtin.command: uberspace web domain add {{ frontend_domain }}
+      register: new_domain
+      changed_when: true
+    - name: Print out important information
+      changed_when: false
+      ansible.builtin.debug:
+        msg: "{{ new_domain.stdout }}"

ansible/roles/frontend/tasks/main.yaml

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+---
+- name: Set up domains
+  ansible.builtin.import_tasks: domains.yaml