Move roles/matrix* to roles/custom/matrix*

This paves the way for installing other roles into `roles/galaxy` using `ansible-galaxy`,
similar to how it's done in:

- https://github.com/spantaleev/gitea-docker-ansible-deploy
- https://github.com/spantaleev/nextcloud-docker-ansible-deploy

In the near future, we'll be removing a lot of the shared role code from here
and using upstream roles for it. Some of the core `matrix-*` roles have
already been extracted out into other reusable roles:

- https://github.com/devture/com.devture.ansible.role.postgres
- https://github.com/devture/com.devture.ansible.role.systemd_docker_base
- https://github.com/devture/com.devture.ansible.role.timesync
- https://github.com/devture/com.devture.ansible.role.vars_preserver
- https://github.com/devture/com.devture.ansible.role.playbook_runtime_messages
- https://github.com/devture/com.devture.ansible.role.playbook_help

We just need to migrate to those.

roles/custom/matrix-jitsi/tasks/setup_jitsi_prosody.yml

@@ -0,0 +1,99 @@
+---
+
+#
+# Tasks related to setting up jitsi-prosody
+#
+
+- name: Ensure Matrix jitsi-prosody environment exists
+  ansible.builtin.file:
+    path: "{{ item.path }}"
+    state: directory
+    mode: 0777
+    owner: "{{ matrix_user_username }}"
+    group: "{{ matrix_user_groupname }}"
+  with_items:
+    - {path: "{{ matrix_jitsi_prosody_base_path }}", when: true}
+    - {path: "{{ matrix_jitsi_prosody_config_path }}", when: true}
+    - {path: "{{ matrix_jitsi_prosody_plugins_path }}", when: true}
+  when: matrix_jitsi_enabled | bool and item.when
+
+- name: Ensure jitsi-prosody Docker image is pulled
+  community.docker.docker_image:
+    name: "{{ matrix_jitsi_prosody_docker_image }}"
+    source: "{{ 'pull' if ansible_version.major > 2 or ansible_version.minor > 7 else omit }}"
+    force_source: "{{ matrix_jitsi_prosody_docker_image_force_pull if ansible_version.major > 2 or ansible_version.minor >= 8 else omit }}"
+    force: "{{ omit if ansible_version.major > 2 or ansible_version.minor >= 8 else matrix_jitsi_prosody_docker_image_force_pull }}"
+  when: matrix_jitsi_enabled | bool
+  register: result
+  retries: "{{ matrix_container_retries_count }}"
+  delay: "{{ matrix_container_retries_delay }}"
+  until: result is not failed
+
+- name: Ensure jitsi-prosody environment variables file is created
+  ansible.builtin.template:
+    src: "{{ role_path }}/templates/prosody/env.j2"
+    dest: "{{ matrix_jitsi_prosody_base_path }}/env"
+    owner: "{{ matrix_user_username }}"
+    group: "{{ matrix_user_groupname }}"
+    mode: 0640
+  when: matrix_jitsi_enabled | bool
+
+- name: Ensure matrix-jitsi-prosody.service file is installed
+  ansible.builtin.template:
+    src: "{{ role_path }}/templates/prosody/matrix-jitsi-prosody.service.j2"
+    dest: "{{ matrix_systemd_path }}/matrix-jitsi-prosody.service"
+    mode: 0644
+  register: matrix_jitsi_prosody_systemd_service_result
+  when: matrix_jitsi_enabled | bool
+
+- name: Ensure systemd service is reloaded after matrix-jitsi-prosody.service installation
+  ansible.builtin.service:
+    daemon_reload: true
+  when: "matrix_jitsi_enabled and matrix_jitsi_prosody_systemd_service_result.changed"
+
+- name: Ensure authentication is properly configured
+  ansible.builtin.include_tasks:
+    file: "{{ role_path }}/tasks/util/setup_jitsi_auth.yml"
+  when:
+    - matrix_jitsi_enabled | bool
+    - matrix_jitsi_enable_auth | bool
+
+
+#
+# Tasks related to getting rid of jitsi-prosody (if it was previously enabled)
+#
+
+- name: Ensure matrix-jitsi-prosody.service file exists
+  ansible.builtin.stat:
+    path: "{{ matrix_systemd_path }}/matrix-jitsi-prosody.service"
+  register: matrix_jitsi_prosody_service_stat
+  when: "not matrix_jitsi_enabled | bool"
+
+- name: Ensure matrix-jitsi-prosody is stopped
+  ansible.builtin.service:
+    name: matrix-jitsi-prosody
+    state: stopped
+    enabled: false
+    daemon_reload: true
+  register: stopping_result
+  when: "not matrix_jitsi_enabled | bool and matrix_jitsi_prosody_service_stat.stat.exists"
+
+- name: Ensure matrix-jitsi-prosody.service file doesn't exist
+  ansible.builtin.file:
+    path: "{{ matrix_systemd_path }}/matrix-jitsi-prosody.service"
+    state: absent
+  when: "not matrix_jitsi_enabled | bool and matrix_jitsi_prosody_service_stat.stat.exists"
+
+- name: Ensure systemd is reloaded after matrix-jitsi-prosody.service removal
+  ansible.builtin.service:
+    daemon_reload: true
+  when: "not matrix_jitsi_enabled | bool and matrix_jitsi_prosody_service_stat.stat.exists"
+
+- name: Ensure Matrix jitsi-prosody paths doesn't exist
+  ansible.builtin.file:
+    path: "{{ matrix_jitsi_prosody_base_path }}"
+    state: absent
+  when: "not matrix_jitsi_enabled | bool"
+
+# Intentionally not removing the Docker image when uninstalling.
+# We can't be sure it had been pulled by us in the first place.