Introduce Nextcloud role and deploy Cloud on Chaosknoten

Co-authored-by: Max <max@mlem.cloud>

playbooks/roles/nextcloud/meta/argument_specs.yaml

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+argument_specs:
+  main:
+    options:
+      nextcloud__version:
+        description: The version label to use for the Nextcloud Docker image.
+        type: str
+        required: true
+      nextcloud__postgres_version:
+        description: The version label to use for the PostgreSQL Docker image.
+        type: str
+        required: true
+      nextcloud__nginx_version_spec:
+        description: The version spec. to pass to nginx to use for the nginx version spec.
+        type: str
+        required: false
+        default: ""
+      nextcloud__certbot_version_spec:
+        description: The version spec. to pass to certbot to use for the certbot version spec.
+        type: str
+        required: false
+        default: ""
+      nextcloud__fqdn:
+        description: The FQDN to use for Nextcloud.
+        type: str
+        required: true
+      nextcloud__data_dir:
+        description: The directory where to store the Nextcloud data.
+        type: str
+        required: true
+      nextcloud__admin_password:
+        description: The password to use for the Admin user.
+        type: str
+        required: true
+      nextcloud__extra_configuration:
+        description: Additional nextcloud configuration.
+        type: str
+        required: false
+        default: ""
+      nextcloud__use_custom_new_user_skeleton:
+        description: >-
+          Enable to make use of the given custom new user skeleton directory.
+        type: bool
+        required: false
+        default: false
+      nextcloud__custom_new_user_skeleton_directory:
+        description: >-
+          Path of to a custom new user skeleton directory to be used by this
+          role via ansible.builtin.copy.
+        type: str
+        required: false
+        default: ""
+      nextcloud__postgres_password:
+        description: The password to use for the nextcloud PostgreSQL user.
+        type: str
+        required: true
+      nextcloud__proxy_protocol_reverse_proxy_ip:
+        description: The IP of the reverse proxy to do proxy protocol with.
+        type: str
+        required: true
+      nextcloud__certbot_acme_account_email_address:
+        description: The E-Mail address to pass to certbot to use for the ACME account.
+        type: str
+        required: true

playbooks/roles/nextcloud/meta/main.yaml

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+---
+dependencies:
+  - role: certbot
+    vars:
+      certbot__version_spec: "{{ nextcloud__certbot_version_spec }}"
+      certbot__acme_account_email_address: "{{ nextcloud__certbot_acme_account_email_address }}"
+      certbot__certificate_domains:
+        - "{{ nextcloud__fqdn }}"
+  - role: nginx
+    vars:
+      nginx__version_spec: "{{ nextcloud__nginx_version_spec }}"
+      nginx__configurations: 
+        - name: "{{ nextcloud__fqdn }}"
+          content: "{{ lookup('ansible.builtin.template', 'nginx_nextcloud.conf.j2') }}"
+  - role: docker_compose
+    vars:
+      docker_compose__compose_file_content: "{{ lookup('ansible.builtin.template', 'compose.yaml.j2') }}"
+      docker_compose__configuration_files: []