Deploy a reverse proxy doing PROXY Protocol

This is needed to be able to nicely host multiple services under a
single IPv4.
The reverse proxy also includes a configuration to pass requests for
acme challenge properly.
And lastly the reverse proxy is already configured for a stirling pdf,
which gets added once the DNS record for it is in place.

inventories/hetzner/host_vars/cit-docker-host.yaml

@@ -1 +1,3 @@
-docker_compose__projects: [ ]
+docker_compose__projects:
+  - name: reverse-proxy
+    files_directory: ../docker_compose_applications/reverse-proxy