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/templates/jvb/env.j2

@@ -0,0 +1,31 @@
+DOCKER_HOST_ADDRESS
+ENABLE_COLIBRI_WEBSOCKET
+ENABLE_OCTO
+JVB_AUTH_USER={{ matrix_jitsi_jvb_auth_user }}
+JVB_AUTH_PASSWORD={{ matrix_jitsi_jvb_auth_password }}
+JVB_BREWERY_MUC={{ matrix_jitsi_jvb_brewery_muc }}
+JVB_PORT={{ matrix_jitsi_jvb_rtp_udp_port }}
+JVB_TCP_HARVESTER_DISABLED=true
+JVB_TCP_PORT={{ matrix_jitsi_jvb_rtp_tcp_port }}
+JVB_TCP_MAPPED_PORT={{ matrix_jitsi_jvb_rtp_tcp_port }}
+{% if matrix_jitsi_jvb_stun_servers|length > 0 %}
+JVB_STUN_SERVERS={{ matrix_jitsi_jvb_stun_servers|join(',') }}
+{% endif %}
+JVB_OCTO_BIND_ADDRESS
+JVB_OCTO_PUBLIC_ADDRESS
+JVB_OCTO_BIND_PORT
+JVB_OCTO_REGION
+JVB_WS_DOMAIN
+JVB_WS_SERVER_ID
+PUBLIC_URL={{ matrix_jitsi_web_public_url }}
+SENTRY_DSN="${JVB_SENTRY_DSN:-0}"
+SENTRY_ENVIRONMENT
+SENTRY_RELEASE
+COLIBRI_REST_ENABLED
+SHUTDOWN_REST_ENABLED
+TZ={{ matrix_jitsi_timezone }}
+XMPP_AUTH_DOMAIN={{ matrix_jitsi_xmpp_auth_domain }}
+XMPP_INTERNAL_MUC_DOMAIN={{ matrix_jitsi_xmpp_internal_muc_domain }}
+XMPP_SERVER={{ matrix_jitsi_xmpp_server }}
+
+{{ matrix_jitsi_jvb_environment_variables_extension }}