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.

Check IRC appservice service is present before stopping it

Server migration doc update

Annotate server migration with a note in regard to migration between different architectures and the need to dump/restore the database.

Update PostgreSQL Maintenance page

Added a mid-sized VPS configuration with configuration changes to the PostgreSQL database config.

Deleted single quotes in one of the examples to unify the examples

Update IRC appservice

Synapse LDAP auth: add support for Active Directory

Mjolnir antispam

Updated nginx-proxy (1.20.0 -> 1.21.0)

GoMatrixHosting v0.4.7

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1084

Conversation: https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/1083#discussion_r638671860

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

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

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/1024

HSTS preload + X-XSS enables

OCSP Stapling SSL manually-managed

# chain.pem file is required for 'ssl_trusted_certificate`