Add dns config example and add it to integration tests

* Add action for starting integration tests
* Configure nginx to resolve DNS record
* Sync itest.yml and docs/scripts/Readme.md

resolve #100

docs/scripts/TLSConfigsForITest.sh

@@ -1,5 +1,3 @@
-#!/usr/bin/env bash
-
 # This file is Free Software under the MIT License
 # without warranty, see README.md and LICENSES/MIT.txt for details.
 #
@@ -35,14 +33,14 @@ echo '
         ssl_certificate_key '${SSL_CERTIFICATE_KEY}'; # e.g. ssl_certificate_key /etc/ssl/csaf/testserver-key.pem;
 
         ssl_protocols TLSv1.2 TLSv1.3;
-' > TLSConfigs.txt
+' > ~/${FOLDERNAME}/TLSConfigs.txt
 
 # a second listener port for testing setup where someone wants to tunnel access
 # to an unpriviledged port and still have the same access url
 echo '
         listen 8443 ssl default_server; # ipv4
         listen [::]:8443 ssl http2 default_server;  # ipv6
-' > TLS8443Configs.txt
+' > ~/${FOLDERNAME}/TLS8443Configs.txt
 
 sudo cp $NGINX_CONFIG_PATH $NGINX_CONFIG_PATH.org
 sudo sed -i "/^server {/r ${HOME}/${FOLDERNAME}/TLSConfigs.txt" $NGINX_CONFIG_PATH