[TF-A] OpenCI and trusted-firmware-ci organization in github

Hi Everyone,

If you get an invite to join the trusted-firmware-ci organization in Github it’s to allow all the project contributors seeded from the TF-A maintainers file (maintainers and code owners) to have the privileges to be able to perform Jenkin job rebuilds from the OpenCI Jenkins pages for the TF-A project. All the TF-A project maintainers will have the admin ability to add new people.

Thanks

Joanna