No functionality changed

* synapse-admin arm64 builds available since 2021-12-17 v.0.8.4 [awesometechnologies/synapse-admin:0.8.5](https://hub.docker.com/layers/synapse-admin/awesometechnologies/synapse-admin/0.8.5/images/sha256-eb54b8660c4641641b8acd08fd2dfc94ecc3fc604860f9e8b286a38008e3f3b6?context=explore)

* coturn arm32/arm64 builds available since 2021-04-15 v.4.5.2-r0-alpine [coturn/coturn:4.5.2-r12](https://hub.docker.com/layers/coturn/coturn/coturn/4.5.2-r12/images/sha256-94887581bb1093085033be0494c3a651bd40034afba1867ddc78b8ba32dc2faf?context=explore)

Based on mautrix-whatsapp, as that's what the bridge software is based on.

* Add matrix-registration-bot

This adds an install and uninstall task plus helpers. The bot is disabled by default.
This commit does not include documentation, yet. In short, the bot can be enabled by adding
matrix_bot_matrix_registration_bot_enabled: true
matrix_bot_matrix_registration_bot_matrix_user_password: "verysecret"
matrix_bot_matrix_registration_bot_matrix_admin_token: "supersecret"
to the host_vars

* Change bot username to bot.matrix-registration-bot following convention

* Address smaller remarks, fix local docker build

* Switch to an env file

* Add environment variables extension for additional config

* Add documentation for the matrix-registration-bot

* Add screenshot on how to obtain admin access token

* Use bot as admin to only have one access token (bot and admin api)

* Use cleaner setting of matrix_synapse_registration_requires_token

* Use config file for cleaner more secure usage

* Delete unneeded env

* Rename vars to make usage clear

* Fix typos/wording and add notice about logging out

* Convert configuration to use |to_json

* Reorder role includes

Nothing should be after `matrix-common-after`.

`matrix-bot-matrix-registration-bot` can probably be anywhere, but it makes sense to put it next to the other `matrix-bot-*` roles.

* Minor group_vars/matrix_servers touchups

Co-authored-by: Slavi Pantaleev <slavi@devture.com>

https://github.com/matrix-org/matrix-hookshot/releases/tag/1.4.0

Add support for multiple external turn IP addresses, this allows for better comptability with dualstack ipv4/ipv6 hosts, and is supported as per the documentation (point 6 here: https://matrix-org.github.io/synapse/latest/turn-howto.html#configuration)

The `halfshot/matrix-hookshot` container images published to Docker Hub
(as of 2022-04-05, at least) are only available for `amd64`, not for
`arm64`. Self-building on arm64 is necessary.

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/1728

It should be noted that a `roiarthurb/matrix-hookshot` container image is available,
which is available for the arm64 platform, but that's non-official and doesn't
contain an amd64 build, so it's of limited use.

* add borg backup

* lint fix

* add exlclude patterns

* missed in the #1726 fix for honoroit

* feedback

* Fix indentation

* feedback

* feedback

* feedback

Co-authored-by: Slavi Pantaleev <slavi@devture.com>

As mentioned in the changelog, this is a breaking change.

Various roles depend on this. It makes sense to make it part
of the `matrix-base` role.

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1682

Previously, when matrix-postgres was disabled, we were setting
`matrix_mautrix_twitter_database_engine` to an invalid empty value.

Now, we always hardcode `matrix_mautrix_twitter_database_engine: postgres`,
but set/unset the database hostname and password values instead.

Co-authored-by: Procuria <37988494+Procuria@users.noreply.github.com>

1.0.2 is the first container image tag that is available as a multi-arch image
with support for linux/amd64, linux/arm64/v8 (arm64) and linux/arm/v7 (arm32),
so self-building is no longer necessary on all these platforms.

4.95-r0-1 is the first container image tag that is available as a multi-arch image
with support for linux/amd64, linux/arm64/v8 (arm64) and linux/arm/v7 (arm32),
so self-building is no longer necessary on all these platforms.

2.2.3 is the first container image tag that is available as a multi-arch image
with support for linux/amd64, linux/arm64/v8 (arm64) and linux/arm/v7 (arm32),
so self-building is no longer necessary on all these platforms.

it's required if enabled by the dimension config here:
6eb8fb8392/roles/matrix-etherpad/tasks/init.yml (L42-L49)

see also #1517

related 0fb881deb5