Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1070

Related discussion here: 1ab507349c (commitcomment-51108407)

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1070

This release fixes a denial of service attack (CVE-2021-29471) against Synapse's push rules implementation. Server admins are encouraged to upgrade.

Ref: https://github.com/matrix-org/synapse/releases/tag/v1.33.2

This reverts commit 1fb54a37cb.

Seems like it's been pulled or something. It used to exist, but not
anymore. Not sure what's going on.

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1017

Related to
https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1010

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1010

This reverts commit f825c7c263.

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1010

Signed-off-by: Ahmad Haghighi <haghighi@fedoraproject.org>

Fixes a regression introduced in ffe649a240

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/958

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/958

Fixes a regression caused by a5ee39266c.

If the user id and group id were different than 991:991
(which used to be a hardcoded default for us long ago),
there was a mismatch between what Synapse was trying to use (991:991)
and what it was actually started with (in `--user=..`). It was then
trying to change ownership, which was failing.

This was mostly affecting newer installations which were not using the
991:991 defaults we had long ago (since a1c5a197a9).

This allows us to benefit from helpful things it does for us,
like enabling jemalloc: https://github.com/matrix-org/synapse/pull/8553

We weren't going through `start.py` before, because it was causing some
conflict with our `docker run --user=...` stuff, but it doesn't seem
to be a problem anymore.

Having done this, we won't need to do things like
https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/941
anymore.

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/456

Adding more presets in the future would be nice.

Related to: https://matrix.org/blog/2021/02/18/synapse-1-27-0-released#dropping-armv7-docker-images

This give us the possibility to run multiple instances of
workers that that don't expose a port.

Right now, we don't support that, but in the future we could
run multiple `federation_sender` or `pusher` workers, without
them fighting over naming (previously, they'd all be named
something like `matrix-synapse-worker-pusher-0`, because
they'd all define `port` as `0`).

Related to:
- https://github.com/matrix-org/synapse/pull/9407
- https://github.com/matrix-org/synapse/pull/7855

This leads to much easier management and potential safety
features (validation). In the future, we could try to avoid port
conflicts as well, but it didn't seem worth the effort to do it now.
Our port ranges seem large enough.

This can also pave the way for a "presets" feature
(similar to `matrix_nginx_proxy_ssl_presets`) which makes it even easier
for people to configure worker counts.

`::` leads to errors like:

> socket.gaierror: [Errno -9] Address family for hostname not supported

This will make data migration easier.

Fixes:
https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/833