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-dynamic-dns/templates/ddclient.conf.j2

@@ -0,0 +1,26 @@
+daemon={{ matrix_dynamic_dns_daemon_interval }}
+syslog=no
+pid=/var/run/ddclient/ddclient.pid
+ssl=yes
+use={{ matrix_dynamic_dns_use }}
+
+{% for dynamic_dns_domain_configuration in matrix_dynamic_dns_domain_configurations %}
+protocol={{ dynamic_dns_domain_configuration.protocol }}
+server={{ dynamic_dns_domain_configuration.provider }} {% if 'username' in dynamic_dns_domain_configuration %}
+login='{{ dynamic_dns_domain_configuration.username }}' {% endif %} {% if 'password' in dynamic_dns_domain_configuration %}
+password='{{ dynamic_dns_domain_configuration.password }}' {% endif %} {% if 'static' in dynamic_dns_domain_configuration %}
+static=yes {% endif %} {% if 'custom' in dynamic_dns_domain_configuration %}
+custom=yes {% endif %} {% if 'zone' in dynamic_dns_domain_configuration %}
+zone={{ dynamic_dns_domain_configuration.zone }} {% endif %} {% if 'ttl' in dynamic_dns_domain_configuration %}
+ttl={{ dynamic_dns_domain_configuration.ttl }} {% endif %} {% if 'mx' in dynamic_dns_domain_configuration %}
+mx={{ dynamic_dns_domain_configuration.mx }} {% endif %} {% if 'wildcard' in dynamic_dns_domain_configuration %}
+wildcard=yes {% endif %}
+{{ dynamic_dns_domain_configuration.domain }}
+
+{% endfor %}
+
+
+{% for matrix_dynamic_dns_additional_configuration in matrix_dynamic_dns_additional_configuration_blocks %}
+{{ matrix_dynamic_dns_additional_configuration }}
+
+{% endfor %}

roles/custom/matrix-dynamic-dns/templates/systemd/matrix-dynamic-dns.service.j2

@@ -0,0 +1,36 @@
+#jinja2: lstrip_blocks: "True"
+[Unit]
+Description=Matrix Dynamic DNS
+{% for service in matrix_dynamic_dns_systemd_required_services_list %}
+Requires={{ service }}
+After={{ service }}
+{% endfor %}
+{% for service in matrix_dynamic_dns_systemd_wanted_services_list %}
+Wants={{ service }}
+{% endfor %}
+DefaultDependencies=no
+
+[Service]
+Type=simple
+Environment="HOME={{ matrix_systemd_unit_home_path }}"
+ExecStartPre=-{{ matrix_host_command_sh }} -c '{{ matrix_host_command_docker }} kill matrix-dynamic-dns 2>/dev/null || true'
+ExecStartPre=-{{ matrix_host_command_sh }} -c '{{ matrix_host_command_docker }} rm matrix-dynamic-dns 2>/dev/null || true'
+ExecStart={{ matrix_host_command_docker }} run --rm --name matrix-dynamic-dns \
+			--log-driver=none \
+			--network={{ matrix_docker_network }} \
+  			-e PUID={{ matrix_user_uid }} \
+  			-e PGID={{ matrix_user_gid }} \
+			-v {{ matrix_dynamic_dns_config_path }}:/config:z \
+			{% for arg in matrix_dynamic_dns_container_extra_arguments %}
+			{{ arg }} \
+			{% endfor %}
+			{{ matrix_dynamic_dns_docker_image }}
+
+ExecStop=-{{ matrix_host_command_sh }} -c '{{ matrix_host_command_docker }} kill matrix-dynamic-dns 2>/dev/null || true'
+ExecStop=-{{ matrix_host_command_sh }} -c '{{ matrix_host_command_docker }} rm matrix-dynamic-dns 2>/dev/null || true'
+Restart=always
+RestartSec=30
+SyslogIdentifier=matrix-dynamic-dns
+
+[Install]
+WantedBy=multi-user.target