VBLOCKS-2059: Added CircleCI support to build & publish the Android flavor to Appcenter (WIP)

[afalls-twilio]

Submission Checklist

• [ ] The CHANGELOG.md reflects any feature, bug fixes, or known issues made in the source code
• [ ] New unit tests and integration tests have beed added
• [ ] Code coverage is more or equal to the previous coverage
• [ ] A visual inspection of the Files changed tab was made prior to submitting the pull request ensuring the style guide was followed
• [ ] CI pipeline is green
• [ ] Included screenshot if necessary

Description

[Description of the Pull Request]

Breakdown

• [Bulleted summary of changes]
• [eg. Updated doc]
• [eg. Added precondition to class]

Validation

• [Bulleted summary of validation steps including local and CI pipeline]
• [eg. Added new test]
• [eg. Manually tested with both app and server]

Additional Notes

[Any additional comments, notes, or information relevant to reviewers.]

Contributing to Twilio

All third-party contributors acknowledge that any contributions they provide will be made under the same open-source license that the open-source project is provided under.

• [ ] I acknowledge that all my contributions will be made under the project's license.