As of 0.22.0 there are enough improvements in outputs and exit codes that
it seems to make more sense to no longer try to pretty the results and
just rely on a run and exit status to add a footer telling folks how
to fix up things if something is found.

RELNOTES: None.
PiperOrigin-RevId: 234603600

- Expand the buildkite setup to cover released and latest-green.
- Enable buildifier on buildkite.
- Add a build badge to the README.md.
- Drop travis down to just buildifier since it does some things buildkite
  support doesn't do yet.

RELNOTES: None
PiperOrigin-RevId: 235943968

Bazel's BuildKite seems to be fine for the bazel builds, so remove the support
for doing bazel builds on Travis.

Note: Keeping the matrix as a manual build and some of the conditions in the
scripts just to reduce the chances of something not being right, as eventually
the BuildKite setup will match the buildifier support and these files will
just get dropped.

RELNOTES: None
PiperOrigin-RevId: 236655099

"buildifier: true" has been deprecated by bazelbuild/continuous-integration#542

Closes #18.

RELNOTES: None.
PiperOrigin-RevId: 237246313

bazel ci on buildkite is providing everything now.

RELNOTES: None.
PiperOrigin-RevId: 237521953

This is an NFC, as it supports both the pre- and post- cleanup APIs.

RELNOTES: None
PiperOrigin-RevId: 240998664

RELNOTES: None
PiperOrigin-RevId: 241371321