Automated MMR signing key generation process

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.

chore(deps): update dependency grafana to v11.1.4-0

chore(deps): update joseluisq/static-web-server docker tag to v2.32.2

chore(deps): update vectorim/element-web docker tag to v1.11.74

chore(deps): update ghcr.io/element-hq/synapse docker tag to v1.113.0

Update agru url in justfile

Related to:

- https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/3470
- https://github.com/hifi/heisenbridge/releases/tag/v1.15.0

During testing, it appears that Heisenbridge generated media URLs
that look like this: `{media_url}/_matrix/media/v3/download/DOMAIN/FILE_ID/FILE_NAME`.

This seems off. We were expecting `{media_url}/_heisenbridge/media/something`
(e.g. `https://matrix.DOMAIN/heisenbridge/_heisenbridge/media/something`, leading to its own media proxy),
but Heisenbridge still seems to be generating URLs destined for the homeserver's Media API.

Until we figure out why that is, `media_url` remains pointed to the homeserver URL (just like before),
so that the bot can continue operating like before.

chore(deps): update hif1/heisenbridge docker tag to v1.15.0

chore(deps): update dependency prometheus to v2.54.0-0

chore(deps): update dependency etherpad to v2.2.2-0

Supersedes https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/2336

Related to https://github.com/element-hq/hydrogen-web/pull/996

* Allow redircting abuse-reports to draupnir

* Document redirecting abuse-reports to draupnir via traefik

* Apply suggestions from code review

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

* Rename variable

---------

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

chore(deps): update vectorim/element-web docker tag to v1.11.73

Upgrade Jitsi (v9584-1 -> v9646-0)

chore(deps): update ajbura/cinny docker tag to v4.1.0

* update http2 config due to deprecation

the previous way to let `http2` follow a `listen` was depracated, it
moved to `http2 on;`

* enable quic and http3

I hope the comments are somewhat understandable. if someone can describe
the `reuseport` part more concise, please do.

docs/maintenance-upgrading: indent "either" commands

improves readability

chore(deps): update ghcr.io/t2bot/matrix-media-repo docker tag to v1.3.7

chore(deps): update vectorim/element-web docker tag to v1.11.72

chore(deps): update ghcr.io/element-hq/synapse docker tag to v1.111.1

* Update SaaS section in readme

* Improve sentence wording

* Improve sentence flow

---------

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

chore(deps): update dependency redis to v7.2.5-0

chore(deps): update registry.gitlab.com/etke.cc/postmoogle docker tag to v0.9.20