Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/3369

* fix synapse-admin image prefix

* fix typo

* switch to synapse-admin fork

* Fix typo

* Close unclosed ) and reword sentence

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

Related to:

- https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/3518
- https://github.com/hifi/heisenbridge/issues/294

With this patch, when `matrix_heisenbridge_path_prefix` is the default
one we use (`/heisenbrdige`), URLs like this are constructed:

https://matrix.DOMAIN/heisenbridge/_heisenbridge/media/SERVER_NAME/MEDIA_ID/CHECKSUM/FILENAME

If `matrix_heisenbridge_path_prefix` is set to `/`, URLs like this are constructed:

https://matrix.DOMAIN/_heisenbridge/media/SERVER_NAME/MEDIA_ID/CHECKSUM/FILENAME

Our Traefik labels support handling both cases correctly.

`matrix_client_schildichat_docker_image` was adjusted to use the
Github Container Registry in 171f5f84a2cd058f0c53780, but the Renovate marker was not adjusted.

Related to: https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/3485

Related to https://etke.cc/news/d3uw4utq4t3_rpxicrrfqqou_ynmptqjgk95pt-3n2s/

As reported in https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/3451#issuecomment-2331316593

Likely the solution to https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/3451

* postmoogle v0.9.21

* update postmoogle source code url

* update postmoogle renovate comment

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/3479#issuecomment-2294956958

Shared Secret Auth double puppeting still works for this bridge, but
is deprecated and will go away in the future.

Shared Secret Auth double puppeting still works for this bridge, but
is deprecated and will go away in the future.

Shared Secret Auth double puppeting still works for this bridge, but
is deprecated and will go away in the future.

Shared Secret Auth double puppeting still works for this bridge, but
is deprecated and will go away in the future.

Shared Secret Auth double puppeting still works for this bridge, but
is deprecated and will go away in the future.

Shared Secret Auth double puppeting still works for this bridge, but
is deprecated and will go away in the future.

Shared Secret Auth double puppeting still works for these bridges, but
is deprecated and will go away in the future.

Shared Secret Auth double puppeting still works for this bridge, but
is deprecated and will go away in the future.

Since upgrading mautrix-slack (and pinning to v0.1.0) in e4b54c37fe258b17f49dd7ed58a18ef3abac1c41,
we expect double-puppeting to require the new appservice double-puppeting method.

This commit switches the mautrix-slack bridge to it.

Since upgrading mautrix-signal (v0.6.3 -> v0.7.0) in 76fec0b8632804194ae54dce3328fef2b6e6b3c2,
we expect double-puppeting to require the new appservice double-puppeting method.

This commit switches the mautrix-signal bridge to it.

Bridges will be switched to this new method in future patches.

Related to:
- https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/3479
- https://github.com/mautrix/slack/releases/tag/v0.1.0
- https://mau.fi/blog/2024-08-mautrix-release/

Related to:
- https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/3479
- https://github.com/mautrix/signal/releases/tag/v0.7.0
- https://mau.fi/blog/2024-08-mautrix-release/

It seems like the new version does not support a `/metrics` endpoint.
We skip keep the Ansible variables, but they're not doing anything.

Closes https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/3481

* add synapse-auto-compressor workaround, fixes #3397

* Clarify what the PG-prefixed variables are for

---------

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

No need to duplicate the same logic as in `group_vars/matrix_servers`.

Having it disabled by default in the role itself and overriding it at the playbook level (based on the selected homeserver implementation) makes more sense.