Summary: To make sure that we'll have additional verification for release builds, define a new category and add `make release` to per-diff/post-commit tests. This should in theory prevent the release MyRocks integration builds breaks from happening.
Test Plan:
- `[p]arc diff --preview`
- Observe the execution in Sandcastle and make sure that release build and tests are executed.
Reviewers: sdong
Reviewed By: sdong
Subscribers: andrewkr, dhruba
Differential Revision: https://reviews.facebook.net/D60441