Fixup for #1877.

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

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1772

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1864

Related to https://github.com/zeratax/matrix-registration/issues/93

This is a poor way to do things though. It may break again in the future.
matrix-registration is a poorly maintained project and should likely be removed from the playbook.

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1792

fix Hookshot instructions link

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/1782

The old link returned a 404 so I thought I throw in joinmatrix.org :)

* 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>

Related to:

- https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/1727
- https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/1754
- https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/1755
- https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/467

* matrix-backup-borg: added option for unencrypted repo access

* matrix-backup-borg: fixed requiring password for unencrypted repos; changed variable name

* matrix-backup-borg: add unknown_unencrypted_repo_access_is_ok to config.yaml.j2

* matrix-backup-borg: cleanup comments

* matrix-backup-borg: add documentation regarding unencrypted repos

* matrix-backup-borg: add readability and ease of use to code

* matrix-backup-borg: fix wording in defaults/main.yml comment

* matrix-backup-borg: add quotes to docs

* Indicate the variable to use

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

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

* 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>

More info: https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1699

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

Building mx-puppet-discord appears to have been broken for a while.

Related to:
- https://github.com/matrix-discord/mx-puppet-discord/issues/201
- https://github.com/matrix-discord/mx-puppet-discord/issues/202
- https://github.com/matrix-discord/mx-puppet-discord/issues/203

We'd rather use a fork that is maintained better and by someone who
cares about whether their software works or not, so we'll be using the
Beeper-maintained for from now on.

In the future, we should probably do the same for the Slack bridge
which is also part of the same monorepo
(https://gitlab.com/beeper/mx-puppet-monorepo).

Related to:

- https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1682
- https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1679

"Community" support

- has been removed from mautrix/facebook in v0.3.3:
  31cac6fb5e

- has been removed from mautrix/signal in v0.2.2:
  1f27a608a6

- will be removed in the next mautrix/instagram release:
  e2ae1ca503

- will be removed in the next mautrix/twitter release:
  3893075265

* Add support for obtain ECDSA keys

* Replace matrix_ssl_lets_encrypt_use_ecdsa_keys for matrix_ssl_lets_encrypt_key_type