Baseline: 275c54c982468b97611dc764c68daed8d7c45004

Cherry picks:

   + 1f52e9a58dd814f203797c5fbab44d9f4d53a43c:
     Support rolling releases in Bazel release scripts.
   + 2f72244183c8c3de722ff1d9e8b0b745d12cd528:
     Fix syntax error in Bazel release scripts
   + 4ef9c566c861848fef7907cf07a6e7d9d15cee7a:
     Fix location of -prerelease option

This release contains contributions from many people at Google, as well as Keith Smiley, Niek Peeters.