6.Rasa x: While using custom actions in rasa x ui there were many problems
6.1.I used external python library so as it is not in list of rasa_sdk libraries I created Dockerfile https://rasa.com/docs/rasa/user-guide/how-to-deploy/.
6.2. In my case docker-compose.override.file was in wrong directory now my directories in that form 
6.3 After creating Docker file next commands are necessary:
6.3.1 First build image docker build . -t <account_username>/<repository_name>:<custom_image_tag>
6.3.2 Second register in DockerHub and create repository
6.3.3 Third login on terminal docker login --username <account_username> --password <account_password> 6.3.4 docker-compose pull app
6.3.5 Push image to DockerHub docker push <account_username>/<repository_name>:<custom_image_tag>
6.3.6 If you have running dockers turn off them sudo docker-compose down else turn on them sudo docker-compose up -d
6.4 The biggest error was in that I looked at endpoints.yml file which was created when I run rasa init but it does not have influence to rasa x.
Thanks to @ricwo and @athenasaurav for advices with Dockerfile. @mloubser thank you very much with correcting location of files and clarifying what should run after what!(Please recheck steps above).Sorry for my english and puctuation.I tried to explain as much as possible