make it possible to redirect to another url, than /webapp (#221)

* make it possible to redirect to another url, than /webapp
* add documentation
* define default value in container
* add value to .env through setup.sh

web/Dockerfile

@@ -5,6 +5,7 @@ ARG VCS_REF
 ARG CODE_VERSION
 
 ENV CODE_VERSION="${CODE_VERSION}"
+ENV DEFAULTREDIRECT="/webapp"
 
 COPY wrapper.sh /usr/local/bin
 COPY kweb.cfg /etc/kweb.cfg

web/README.md

@@ -4,4 +4,14 @@
 
 Reverse Proxy to securely and with as less configuration effort as possible expose Kopano to the public internet.
 
+In its default configuration this container will redirect requests to the root of the domain (so for example when opening https://kopano.demo/ in a browser) to https://kopano.demo/webapp. To redirect to a different path the environment variable `DEFAULTREDIRECT` needs to be configured.
+
+Example:
+```
+# the following value needs to be added to .env
+DEFAULTREDIRECT=/meet
+```
+
+## Information needed when not running your own reverse proxy
+
 The `kopano_webapp` container is accessible on port 9080 and serves the WebApp on `/webapp`.

web/kweb.cfg

@@ -19,7 +19,7 @@
 
 	redir 302 {
 		if {path} is /
-		/ /webapp/
+		/ {%DEFAULTREDIRECT%}/
 	}
 
 	# Config