• Wait for buf to support --descriptor_set_in, see discussion here: Makefile: replace protoc with buf #66913, esp Makefile: replace protoc with buf #66913 (comment)
• Add a shim sh_binary that depends on @com_github_bufbuild_buf//cmd/buf and does nothing except call buf protoc "$@"
• In .bazelrc, add build --proto_compiler=//path/to/shim:protoc
• Patch rules_go to allow configuring the protoc used (see https://github.com/bazelbuild/rules_go/blob/4cd45a2ac59bd00ba54d23ebbdb7e5e2aed69007/proto/compiler.bzl#L218; rename _protoc -> protoc)
• We'll probably have to patch gazelle to allow configuring a protoc as well -- probably something like gazelle:go_protoc //path/to/shim:protoc.

Epic CRDB-8036