Add basic nextcloud deployment

Uses php-fpm image and is served through a simple caddy server.
Automatically deploys by default and can be automatically deployed with
smtp e-mail sending and s3 primary object storage optionally if desired.

Utilizes some necessary hackery for container ordering and startup so
startup is relatively slow (takes around 2-5 minutes at least) but once
running should be stable and uninterrupted.

Implements health-checks for all involved containers.

Switch apache for php-fpm image

group_vars/testing.yml

@@ -12,5 +12,6 @@ miniflux_use_https: no
 searx_use_https: no
 traggo_use_https: no
 monica_use_https: no
+nextcloud_use_https: no
 
 #server_domain: mytest.com