Merge branch 'fix-prosody-acme' into 'master'

Restore dependency on float-infra-acme-storage

See merge request !221

roles/prosody/README.md

+jabber: prosody
+===
+
+Ansible role that installs our [containerized prosody](https://git.autistici.org/ai3/docker/prosody)
+and configures it.
+
+It is meant to run on backends, with connections
+forwarded via *haproxy*, so it terminates SSL on its own (this is necessary
+because haproxy doesn't speak its custom STARTTLS protocol). In order
+to do this, it depends on the *acme-storage* Ansible role, which sets
+up the *replds@acme* service. This pulls in a copy of /etc/credentials/public.
+
+The replds service must be reflected in the *services.yml* configuration
+which is why you can see in *services.im.yml* some service_credentials
+named 'replds-acme', and a corresponding systemd_service.
+
+To configure it, define the list of domains it should support in the

roles/prosody/meta/main.yml

+---
+dependencies:
+  - {role: float-infra-acme-storage}