Pull open source contributions of a member

[Mariatta]

Admin can trigger the process manually. Otherwise, it will run periodically on daily basis.

Background task

• use GitHub API to get get merged and newly created contributions
• store the records we already found on database
• when calling API only fetch records not yet on database (based timestamp of last run)

Create the model of "Member Contribution": The PR object

• member id (foreign key)
• repo (foreign key)
• url/commit hash.

Create the model for repo/project

• the repo URL
• other repo metadata like logo, description, tag, category,
• GitHub ID
• GitHub name