API for setup build - Github app integration

[guacamole]

Is your feature request related to a problem? Please describe.

For Github App Integration, we only have API's to list repositories and progress to setup build with selected repository.
There is no provision atm for storing the build details like project name, selected branch to trigger builds from, environment variables, etc

Describe the solution you'd like
After setting up github and selecting a repository for project build, user is progressed to "set up build" step. Here we must have APIs that store

• Project name user chooses for the project/Build
• Branch to trigger automated builds from
• Build Command
• Dockerfile directory
• Environment Variables

Describe alternatives you've considered
NA

Additional context
NA