protoc-plugin image is currently broken

[sampajano]

See: #1446 (comment)

The protoc_plugin image is broken since #1445

@benjaminp FYI :)

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UPDATE: Temporarily disabled in #1451

[benjaminp]

I'm afraid I can't spend a huge amount of time digging into all ways there are to build the generator at the moment in this repo. (There's also a build.zig file in the generator directory. What's the used for?) Possibly everything should be reverted until that's in a better place.

[sampajano]

@benjaminp No worries! Appreciate your effort in trying to help anyways!!

build.zig is used for building for ARM architecture (workflow. Whereas other binaries are built using platform-specific workflows: https://github.com/grpc/grpc-web/tree/master/.github/workflows

It's ok.. I think we have to move forward anyways.. I've temporarily disabled protoc_plugin in CI so BUILD is green now. But we have to fix it for a new release to be made :)

[sampajano]

Note to myself: we are currently pinning the protobuf submodule version:

grpc-web/scripts/init_submodules.sh

Line 19 in 20790fc

(cd third_party/protobuf && git checkout tags/v3.15.6)

This is for 2 reasons:

1. For protobuf JS dependencies
2. For building the generator binary

Ideally, (1) should be tackled first — by moving to https://github.com/protocolbuffers/protobuf-javascript, since protobuf has removed JS from its repo.

And then (2) — ensuring Makefile work as before.

[sampajano]

FYI - Once we have this working we can make a test binary for #715