Use protoc as entrypoint

Dockerfile

@@ -1,3 +1,13 @@
+FROM vato.ddns.net:8083/debian:buster AS CGRPC_BUILDER
+
+ARG CGRPC_VERSION=v1.33.2
+
+RUN apt update -y && apt install git build-essential autoconf libtool pkg-config zlib1g-dev -y
+
+RUN git clone -b ${CGRPC_VERSION} --recursive https://github.com/grpc/grpc
+
+RUN cd grpc && make plugins -j 12
+
 FROM vato.ddns.net:8083/alpine
 
 ARG ARCH=x86_64
@@ -22,3 +32,7 @@ RUN rm protoc-gen-grpc-web-*.sha256 && \
     chmod +x /usr/bin/protoc-gen-grpc-web
 
 COPY ./protoc-gen-* /usr/bin/
+
+COPY --from=CGRPC_BUILDER /grpc/bins/opt/grpc_python_plugin /usr/bin/protoc-gen-grpc-python
+
+ENTRYPOINT ["protoc"]

README.md

@@ -1,7 +1,11 @@
 # Protoc Docker
 
 Docker container for generating protobuf code. Right now used in CI only for other projects.
+Smallish image size (~220mb); unfortunately the grpc-swift plugins cause it to blow out as they're statically linked (so don't need foundation or the swift dependencies).
+Not copying them across will save ~100mb in space.
 
 ## TODOS
 
-- Build the swift plugins inside this repo, rather than committing the built plugins
+- Build the swift plugins inside the dockerfile, rather than committing the built plugins
+- Build the grpc-web plugins in the dockerfile, rather than downloading built versions
+- Use CMake/Bazel for building the grpc plugins - [CMake dockerfile](https://hub.docker.com/r/kitware/cmake)