I forked the project and checkout branch dev-db, Then i run 'mvn clean install -Prelease -Dmaven.test.skip=true' to build the project. I found
dolphinscheduler-dist/dolphinscheduler-backend/target
dolphinscheduler-dist/dolphinscheduler-front/target/
dolphinscheduler-dist/dolphinscheduler-src/target/
dolphinscheduler-ui/dist
dolphinscheduler-ui/node
was in the untracked files list.

I checked the .gitignore file and found it is imperfect. To solve it we can edit the .gitignore file and add this lines:
**/**/target/**
dolphinscheduler-ui/dist
dolphinscheduler-ui/dist

@qiaozhanwei
Is it a bug? And can I update the .gitignore file?