Create buf-breaking-check.yml (#625)
* Create buf-breaking-check.yml
buf breaking test for grpc proto file to prevent checking in breaking changes and maintaining backward compatibility
Follow up to: https://github.com/sourcegraph/sourcegraph/pull/55131
* Update buf-breaking-check.yml
add workflow_dispatch: {}
* Update .github/workflows/buf-breaking-check.yml
Co-authored-by: William Bezuidenhout <william.bezuidenhout@sourcegraph.com>
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Co-authored-by: William Bezuidenhout <william.bezuidenhout@sourcegraph.com>