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-etherpad/templates/settings.json.j2

@@ -0,0 +1,116 @@
+{
+  "title": {{ matrix_etherpad_title|to_json }},
+  "favicon": "favicon.ico",
+  "skinName": "colibris",
+  "skinVariants": "super-light-toolbar super-light-editor light-background",
+  "ip": "::",
+  "port": 9001,
+  "showSettingsInAdminPage": true,
+  "dbType": {{ matrix_etherpad_database_engine|to_json }},
+  "dbSettings": {
+    "database": {{ matrix_etherpad_database_name|to_json }},
+    "host":     {{ matrix_etherpad_database_hostname|to_json }},
+    "password": {{ matrix_etherpad_database_password|to_json }},
+    "port":     {{ matrix_etherpad_database_port|to_json }},
+    "user":     {{ matrix_etherpad_database_username|to_json }}
+  },
+  "defaultPadText" : {{ matrix_etherpad_default_pad_text|to_json }},
+  "suppressErrorsInPadText": false,
+  "requireSession": false,
+  "editOnly": false,
+  "minify": true,
+  "maxAge": 21600,
+  "abiword": null,
+  "soffice": null,
+  "tidyHtml": null,
+  "allowUnknownFileEnds": true,
+  "requireAuthentication": false,
+  "requireAuthorization": false,
+  "trustProxy": true,
+  "cookie": {
+    "sameSite": "Lax"
+  },
+  "disableIPlogging": true,
+  "automaticReconnectionTimeout": 0,
+  "scrollWhenFocusLineIsOutOfViewport": {
+    "percentage": {
+      "editionAboveViewport": 0,
+      "editionBelowViewport": 0
+    },
+    "duration": 0,
+    "scrollWhenCaretIsInTheLastLineOfViewport": false,
+    "percentageToScrollWhenUserPressesArrowUp": 0
+  },
+  "socketTransportProtocols" : ["xhr-polling", "jsonp-polling", "htmlfile"],
+  "socketIo": {
+    "maxHttpBufferSize": 10000
+  },
+  "loadTest": false,
+  "dumpOnUncleanExit": false,
+  "indentationOnNewLine": false,
+  "importExportRateLimiting": {
+    "windowMs": 90000,
+    "max": 10
+  },
+  "importMaxFileSize": 52428800,
+  "commitRateLimiting": {
+    "duration": 1,
+    "points": 10
+  },
+  "exposeVersion": false,
+  "padOptions": {
+    "noColors": false,
+    "showControls": true,
+    "showChat": false,
+    "showLineNumbers": true,
+    "useMonospaceFont": false,
+    "userName": false,
+    "userColor": false,
+    "rtl": false,
+    "alwaysShowChat": false,
+    "chatAndUsers": false,
+    "lang": "en-gb"
+  },
+{% if matrix_etherpad_admin_username != "" and matrix_etherpad_admin_password != "" %}
+  "users": {
+    {{ matrix_etherpad_admin_username|to_json }}: {
+      "password": {{ matrix_etherpad_admin_password|to_json }},
+      "is_admin": true
+    }
+  },
+{% endif %}
+  "padShortcutEnabled" : {
+    "altF9": true,
+    "altC": true,
+    "cmdShift2": true,
+    "delete": true,
+    "return": true,
+    "esc": true,
+    "cmdS": true,
+    "tab": true,
+    "cmdZ": true,
+    "cmdY": true,
+    "cmdI": true,
+    "cmdB": true,
+    "cmdU": true,
+    "cmd5": true,
+    "cmdShiftL": true,
+    "cmdShiftN": true,
+    "cmdShift1": true,
+    "cmdShiftC": true,
+    "cmdH": true,
+    "ctrlHome": true,
+    "pageUp": true,
+    "pageDown": true
+  },
+  "loglevel": "INFO",
+  "logconfig" :
+    { "appenders": [
+        { "type": "console",
+          "layout": {"type": "messagePassThrough"}
+        }
+      ]
+    },
+  "customLocaleStrings": {},
+  "enableAdminUITests": false
+}

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

@@ -0,0 +1,44 @@
+#jinja2: lstrip_blocks: "True"
+[Unit]
+Description=Matrix Etherpad
+{% for service in matrix_etherpad_systemd_required_services_list %}
+Requires={{ service }}
+After={{ service }}
+{% endfor %}
+{% for service in matrix_etherpad_systemd_wanted_services_list %}
+Wants={{ service }}
+{% endfor %}
+DefaultDependencies=no
+
+[Service]
+Type=simple
+Environment="HOME={{ matrix_systemd_unit_home_path }}"
+ExecStartPre=-{{ matrix_host_command_docker }} kill matrix-etherpad
+ExecStartPre=-{{ matrix_host_command_docker }} rm matrix-etherpad
+
+ExecStart={{ matrix_host_command_docker }} run --rm --name matrix-etherpad \
+			--log-driver=none \
+			--user={{ matrix_etherpad_user_uid }}:{{ matrix_etherpad_user_gid }} \
+			--cap-drop=ALL \
+			--network={{ matrix_docker_network }} \
+			{% if matrix_etherpad_container_http_host_bind_port %}
+			-p {{ matrix_etherpad_container_http_host_bind_port }}:9001 \
+			{% endif %}
+			--mount type=bind,src={{ matrix_etherpad_base_path }},dst=/data \
+			{% for arg in matrix_etherpad_container_extra_arguments %}
+			{{ arg }} \
+			{% endfor %}
+			{{ matrix_etherpad_docker_image }} \
+			node --experimental-worker src/node/server.js \
+				--settings /data/settings.json --credentials /data/credentials.json \
+				--sessionkey /data/sessionkey.json --apikey /data/apijey.json
+
+
+ExecStop=-{{ matrix_host_command_docker }} kill matrix-etherpad
+ExecStop=-{{ matrix_host_command_docker }} rm matrix-etherpad
+Restart=always
+RestartSec=30
+SyslogIdentifier=matrix-etherpad
+
+[Install]
+WantedBy=multi-user.target