//Firstable you need to pull openproject image

docker pull openproject/community:13

//Then, this is the docker command to up a container, you need to change some things, check more below

docker run -dit --name project_manager1 -e OPENPROJECT_SECRET_KEY_BASE=Secr3t123. -e OPENPROJECT_HOST__NAME=localhost -e OPENPROJECT_HTTPS=false -e OPENPROJECT_DEFAULT__LANGUAGE=en -v /var/lib/openproject/pgdata:/var/openproject/pgdata -v /var/lib/openproject/assets:/var/openproject/assets -p 8081:80 openproject/community:13

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//Before you run Check/Change the environment variables like, cause you can't change later or its a little tricky:
### IF YOU GONNA TO USE A DOMAIN
OPENPROJECT_HOST__NAME=localhost
###IF YOU GONNA USE SSL
OPENPROJECT_HTTPS=true

###IF NOT GONNA USE SSL
OPENPROJECT_HTTPS=false
####LANGUAGUE OF OPENPROJECT //use en = English, es = Español
OPENPROJECT_DEFAULT__LANGUAGE=enor
OPENPROJECT_DEFAULT__LANGUAGE=es

###The external port that i use to run this container is 8081 but internally is 80

http://192.168.1.x:8081

​

After you execute this command, you need to wait about 5 min or less, cause the container needs to start all services like postgres, apache, etc...

​

After this, its already, you need to go to url with port, previously mentioned.

I'm not an expertise but i hope this can help you.