Move to the CodeBuild service, on the left menu choose Build projects, then select Create project.
Then:
In the Project name field, enter FCJ_Build_Project.
In the Source 1 - Primary field, choose provider AWS CodeCommit, then select repo FCJ_Repo.
In the Branch field, choose master.
Open the Additional configuration section, then tick Enable this flag if you want to build Docker images or want your builds to get elevated privileges.
In the Buildspec section, tick Use a buildspec file, enter buildspec.yml.
Scroll down and choose Create build project.
Confirm that the build project has been created successfully.