Lock pipeline - run pipeline sequentialy

Hi,

I set up a group Runner on my GitLab instance. I want to avoid my runner execute jobs in parallel in differents projects. I want the runner runs every jobs of a pipeline before to begin another.

To be more understandable, my runners make these actions:
BUILD [Project1]
BUILD [Project2]
DEPLOY [Project 1]
DEPLOY [Project 2]

And I would Like:
BUILD [Project1]
DEPLOY [Project 1]
BUILD [Project2]
DEPLOY [Project 2]

I did not find solution by reading the others topics.

I hope you understand my problem and what I am looking for. I apologize for my english :s.

Regards,
Vincent