Update configuring-playbook-synapse.md

Added an example for configuring the variables for the OpenID, that might fails because the variables are not defined for the playbook parsing, but Synapse's own config file parsing.

GoMatrixHosting v0.5.0

update hydrogen v0.1.56 -> v0.1.57

Update grafana 8.0.0 -> 8.0.2

https://github.com/vector-im/hydrogen-web/releases/tag/v0.1.57

Add ability to configure jitsi-prosody to load custom modules

coturn update

Update grafana 7.5.7 -> 8.0.0

Update element 1.7.29 -> 1.7.30

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/1108

fix error when running with Ansible 2.7 in the hydrogen setup

Update IRC appservice

Without this the hydrogen task would fail for Ansible 2.7 even when hydrogen is not enabled.

GoMatrixHosting v0.4.9

Update hydrogen-web version to v0.1.56

Update hydrogen-web version to v0.1.56

GoMatrixHosting v0.4.8

prometheus security update 2.27.1

Heisenbridge identd on unprivileged port

Fixes running the container as an unprivileged user.

Fix local/bin scripts autocompletion by adding rx perms to everyone

It's mildly annoying when trying to execute these scripts while logged
in as a regular user, as the missing execute permissions will hinder
autocompletion even when trying to use with sudo.

These shell scripts don't contain secrets, but may fail when ran by a
regular user. The failure is due to the lack of access to the /matrix
directory, and does not result in any damage.

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/1057

Minor correction

Add support for a prometheus postgres exporter

Update IRC channel

This commit introduces a new role that downloads and installs the
prometheus community postgres exporter  https://github.com/prometheus-community/postgres_exporter.
A new credential is added to matrix_postgres_additional_databases that
allows the exporter access to the database to gather statistics.
A new dashboard was added to the grafana role, with some refactoring
to enable the dashboard only if the new role is enabled.
I've included some basic instructions for how to enable the role in
the Docs section.

In terms of testing, I've tested enabling the role, and disabling
it to make sure it cleans up the container and systemd role.