Add example to run meet standalone (#90)

* refactor ssl generation
make ssl certificate names match container names
add dns names to certificates
* add example to run meet and its dependencies together with an existing kopano
* update webapp example
* remove port numbers from ssl cert
as these could have been specified in a demo environment
* set default values for HTTP, HTTPS and EMAIL
fail if FQDN is unset
make smtp and kopano-server ports configurable
* add hint about 2015 to setup.sh
* also add new defaults to webapp compose
* add example for standalone core as well

examples/webapp.yml

@@ -2,24 +2,33 @@ version: "3.5"
 
 services:
   web:
-    image: ${docker_repo:?err}/kopano_web
+    image: ${docker_repo:-zokradonh}/kopano_web
     container_name: web
     restart: always
     ports:
       - "2015:2015"
-      - "${HTTP}:8080"
-      - "${HTTPS}:8443"
+      - "${HTTP}:80"
+      - "${HTTPS}:443"
     environment:
       - EMAIL=${EMAIL}
       - FQDN=${FQDN}
     command: wrapper.sh
+    cap_drop:
+     - ALL
+    cap_add:
+     - NET_BIND_SERVICE
+     - CHOWN
+     - SETGID
+     - SETUID
     volumes:
       - web:/.kweb
     networks:
-      - web-net
+      web-net:
+        aliases:
+         - ${FQDN}
 
   kopano_webapp:
-    image: ${docker_repo:?err}/kopano_webapp:${WEBAPP_VERSION}
+    image: ${docker_repo:-zokradonh}/kopano_webapp:${WEBAPP_VERSION:-latest}
     hostname: kopano_webapp
     container_name: kopano_webapp
     volumes: