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-corporal/templates/config.json.j2

@@ -0,0 +1,38 @@
+{
+	"Matrix": {
+		"HomeserverDomainName": "{{ matrix_corporal_matrix_homeserver_domain_name }}",
+		"HomeserverApiEndpoint": "{{ matrix_corporal_matrix_homeserver_api_endpoint }}",
+		"AuthSharedSecret": "{{ matrix_corporal_matrix_auth_shared_secret }}",
+		"RegistrationSharedSecret": "{{ matrix_corporal_matrix_registration_shared_secret }}",
+		"TimeoutMilliseconds": {{ matrix_corporal_matrix_timeout_milliseconds }}
+	},
+
+	"Corporal": {
+		"UserID": "@{{ matrix_corporal_corporal_user_id_local_part }}:{{ matrix_domain }}"
+	},
+
+	"Reconciliation": {
+		"RetryIntervalMilliseconds": {{ matrix_corporal_reconciliation_retry_interval_milliseconds }}
+	},
+
+	"HttpGateway": {
+		"ListenAddress": "0.0.0.0:41080",
+		"TimeoutMilliseconds": {{ matrix_corporal_http_gateway_timeout_milliseconds }},
+		"InternalRESTAuth": {
+			"Enabled": {{ matrix_corporal_http_gateway_internal_rest_auth_enabled|to_json }}
+		}
+	},
+
+	"HttpApi": {
+		"Enabled": {{ matrix_corporal_http_api_enabled|to_json }},
+		"ListenAddress": "0.0.0.0:41081",
+		"AuthorizationBearerToken": "{{ matrix_corporal_http_api_auth_token }}",
+		"TimeoutMilliseconds": {{ matrix_corporal_http_api_timeout_milliseconds }}
+	},
+
+	"PolicyProvider": {{ matrix_corporal_policy_provider_config }},
+
+	"Misc": {
+		"Debug": {{ matrix_corporal_debug|to_json }}
+	}
+}

roles/custom/matrix-corporal/templates/systemd/matrix-corporal.service.j2

@@ -0,0 +1,44 @@
+#jinja2: lstrip_blocks: "True"
+[Unit]
+Description=Matrix Corporal
+{% for service in matrix_corporal_systemd_required_services_list %}
+Requires={{ service }}
+After={{ 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-corporal 2>/dev/null || true'
+ExecStartPre=-{{ matrix_host_command_sh }} -c '{{ matrix_host_command_docker }} rm matrix-corporal 2>/dev/null || true'
+
+ExecStart={{ matrix_host_command_docker }} run --rm --name matrix-corporal \
+			--log-driver=none \
+			--user={{ matrix_user_uid }}:{{ matrix_user_gid }} \
+			--cap-drop=ALL \
+			--read-only \
+			--network={{ matrix_docker_network }} \
+			{% if matrix_corporal_container_http_gateway_host_bind_port %}
+			-p {{ matrix_corporal_container_http_gateway_host_bind_port }}:41080 \
+			{% endif %}
+			{% if matrix_corporal_container_http_api_host_bind_port %}
+			-p {{ matrix_corporal_container_http_api_host_bind_port }}:41081 \
+			{% endif %}
+			--mount type=bind,src={{ matrix_corporal_config_dir_path }},dst=/etc/matrix-corporal,ro \
+			--mount type=bind,src={{ matrix_corporal_cache_dir_path }},dst=/var/cache/matrix-corporal \
+			--mount type=bind,src={{ matrix_corporal_var_dir_path }},dst=/var/matrix-corporal \
+			{% for arg in matrix_corporal_container_extra_arguments %}
+			{{ arg }} \
+			{% endfor %}
+			{{ matrix_corporal_docker_image }} \
+			/matrix-corporal -config=/etc/matrix-corporal/config.json
+
+ExecStop=-{{ matrix_host_command_sh }} -c '{{ matrix_host_command_docker }} kill matrix-corporal 2>/dev/null || true'
+ExecStop=-{{ matrix_host_command_sh }} -c '{{ matrix_host_command_docker }} rm matrix-corporal 2>/dev/null || true'
+Restart=always
+RestartSec=30
+SyslogIdentifier=matrix-corporal
+
+[Install]
+WantedBy=multi-user.target