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-coturn/tasks/setup_install.yml

@@ -0,0 +1,111 @@
+---
+
+# This is a cleanup/migration task. It can be removed some time in the future.
+- name: (Migration) Remove deprecated cronjob
+  ansible.builtin.file:
+    path: "{{ matrix_cron_path }}/matrix-coturn-ssl-reload"
+    state: absent
+
+- name: Ensure Matrix Coturn path exists
+  ansible.builtin.file:
+    path: "{{ item.path }}"
+    state: directory
+    mode: 0750
+    owner: "{{ matrix_user_username }}"
+    group: "{{ matrix_user_groupname }}"
+  with_items:
+    - {path: "{{ matrix_coturn_docker_src_files_path }}", when: "{{ matrix_coturn_container_image_self_build }}"}
+  when: "item.when | bool"
+
+- name: Ensure Coturn image is pulled
+  community.docker.docker_image:
+    name: "{{ matrix_coturn_docker_image }}"
+    source: "{{ 'pull' if ansible_version.major > 2 or ansible_version.minor > 7 else omit }}"
+    force_source: "{{ matrix_coturn_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_coturn_docker_image_force_pull }}"
+  when: "not matrix_coturn_container_image_self_build | bool"
+  register: result
+  retries: "{{ matrix_container_retries_count }}"
+  delay: "{{ matrix_container_retries_delay }}"
+  until: result is not failed
+
+- when: "matrix_coturn_container_image_self_build | bool"
+  block:
+    - name: Ensure Coturn repository is present on self-build
+      ansible.builtin.git:
+        repo: "{{ matrix_coturn_container_image_self_build_repo }}"
+        dest: "{{ matrix_coturn_docker_src_files_path }}"
+        version: "{{ matrix_coturn_container_image_self_build_repo_version }}"
+        force: "yes"
+      become: true
+      become_user: "{{ matrix_user_username }}"
+      register: matrix_coturn_git_pull_results
+
+    - name: Ensure Coturn Docker image is built
+      community.docker.docker_image:
+        name: "{{ matrix_coturn_docker_image }}"
+        source: build
+        force_source: "{{ matrix_coturn_git_pull_results.changed 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_coturn_git_pull_results.changed }}"
+        build:
+          dockerfile: "{{ matrix_coturn_container_image_self_build_repo_dockerfile_path }}"
+          path: "{{ matrix_coturn_docker_src_files_path }}"
+          pull: true
+
+- name: Ensure Coturn configuration path exists
+  ansible.builtin.file:
+    path: "{{ matrix_coturn_base_path }}"
+    state: directory
+    mode: 0750
+    owner: "{{ matrix_user_username }}"
+    group: "{{ matrix_user_groupname }}"
+
+- name: Ensure turnserver.conf installed
+  ansible.builtin.template:
+    src: "{{ role_path }}/templates/turnserver.conf.j2"
+    dest: "{{ matrix_coturn_config_path }}"
+    mode: 0644
+    owner: "{{ matrix_user_username }}"
+    group: "{{ matrix_user_groupname }}"
+
+- name: Ensure Coturn network is created in Docker
+  community.docker.docker_network:
+    name: "{{ matrix_coturn_docker_network }}"
+    driver: bridge
+
+- name: Ensure matrix-coturn.service installed
+  ansible.builtin.template:
+    src: "{{ role_path }}/templates/systemd/matrix-coturn.service.j2"
+    dest: "{{ matrix_systemd_path }}/matrix-coturn.service"
+    mode: 0644
+  register: matrix_coturn_systemd_service_change_results
+
+# This may be unnecessary when more long-lived certificates are used.
+# We optimize for the common use-case though (short-lived Let's Encrypt certificates).
+# Reloading doesn't hurt anyway, so there's no need to make this more flexible.
+- name: Ensure reloading systemd units installed, if necessary
+  ansible.builtin.template:
+    src: "{{ role_path }}/templates/systemd/{{ item }}.j2"
+    dest: "{{ matrix_systemd_path }}/{{ item }}"
+    mode: 0644
+  register: "matrix_coturn_systemd_service_change_results"
+  when: "matrix_coturn_tls_enabled | bool"
+  with_items:
+    - matrix-coturn-reload.service
+    - matrix-coturn-reload.timer
+
+# A similar task exists in `setup_uninstall.yml`
+- name: Ensure reloading systemd units uninstalled, if unnecessary
+  ansible.builtin.file:
+    path: "{{ item }}"
+    state: absent
+  register: "matrix_coturn_systemd_service_change_results"
+  when: "not matrix_coturn_tls_enabled | bool"
+  with_items:
+    - matrix-coturn-reload.service
+    - matrix-coturn-reload.timer
+
+- name: Ensure systemd reloaded if systemd units changed
+  ansible.builtin.service:
+    daemon_reload: true
+  when: "matrix_coturn_systemd_service_change_results.changed"