This commit adds a 'matrix-ntfy' role that runs Ntfy server in Docker with
simple configuration, and plumbing to add the role to the playbook.

TODO: documentation, self-check, database persistence.

`localhost` may resolve to `::1` on some IPv6-enabled systems, which will
not work, because we only potentially expose container ports on
`127.0.0.1` when nginx is disabled (`matrix_nginx_proxy_enabled: false`),
not on `::1`.

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1914

We redefine these variables in `group_vars/matrix_servers`, but it's better
to have some defaults in the role as well.

.. regardless of whether matrix-nginx-proxy runs in a container or not

When setting `matrix_nginx_proxy_enabled: false` and enabling authentication on the metrics endpoint, the htpasswd file is hardcoded to the nginx-proxy container dir, this changes the hardcoded value to a variable so the path can be updated

* Add support for obtain ECDSA keys

* Replace matrix_ssl_lets_encrypt_use_ecdsa_keys for matrix_ssl_lets_encrypt_key_type

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1498

Seems like Dendrite encourages serving both the Client and Federation
API at the same port.

Coming from Synapse and how things are done there, we have separate
ports. Using separate ports probably makes matrix-corporal (etc.)
integration easier, so separating the APIs by default probably makes
sense.

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1468

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1393

https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/1311#issuecomment-945718866

for matrix_nginx_proxy_proxy_synapse_metrics_basic_auth_key
resolves #1308

when matrix_nginx_proxy_proxy_synapse_metrics is enabled

* add timeout param for nginx proxy

default value matrix_nginx_proxy_request_timeout is 60s

* default matrix_nginx_proxy_request_timeout - 60s

* few more variables for request timeout

* Update nginx.conf.j2

* Update nginx.conf.j2

This reverts commit 732051b8fc.

There's no such container image published yet.

http://nginx.org/en/CHANGES