set-up codegen from sigstore bundle protobufs

[bdehamer]

Signed-off-by: Brian DeHamer [email protected]

Summary

Adds some plumbing to automatically codegen types for the sigstore bundle format from the published protobufs.

Types can be re-generated by executing the following:

npm run codegen:bundle

The generated types are written to src/bundle/__generated__.

Release Note

• New script in package.json for re-generating bundle types from their protobufs

[bdehamer]

cc @kommendorkapten @patflynn generating TypeScript types from the protobufs in https://github.com/sigstore/cosign/pull/2204

[feelepxyz]

@bdehamer just force pushed as I forgot to add sig-off info on the commits.

[feelepxyz]

@eddiezane 👋 gentle bump, did you have any ideas for improvements here?

[bdehamer]

@feelepxyz thanks for working on this. I took what you did and refactored a bit:

• Moved the script and Dockerfile into a new hack directory (I think this was one of the things @eddiezane had suggested)
• That bit where the same script was being used to initiate the docker build and also served as the entrypoint of the container was a bit too 🤯 for my simple brain. I split these two responsibilities into separate scripts that I think are a bit easier to grok.
• I moved the retrieval of the cosign proto files out of the Dockerfile and back into the generate-bundle-types script. This way, the image we're building becomes a general-purpose protoc wrapper that we can re-use if we find that we need to do more protobuf codegen in the future.