building a plugin with a dependency error

the plugin assembly fails with an error

```
ARG ALPINE_VERSION=3.14.1

FROM alpine:${ALPINE_VERSION} AS cpp
RUN apk update && apk add --no-cache git curl build-base autoconf automake libtool cmake linux-headers

FROM cpp AS grpc-web
ARG GRPC_WEB_VERSION=1.2.1
RUN cd /tmp \
&& git clone --depth 1 --branch ${GRPC_WEB_VERSION} https://github.com/grpc/grpc-web \
&& cd grpc-web \
&& git submodule update --init --recursive
RUN cd /tmp/grpc-web \
&& make install-plugin -j 4
```

```
+] Building 0.4s (7/7) FINISHED
=> [internal] load build definition from Dockerfile 0.0s
=> => transferring dockerfile: 2.18kB 0.0s
=> [internal] load .dockerignore 0.0s
=> => transferring context: 34B 0.0s
=> [internal] load metadata for docker.io/library/alpine:3.14.1 0.0s
=> [cpp 1/2] FROM docker.io/library/alpine:3.14.1 0.0s
=> CACHED [cpp 2/2] RUN apk update && apk add --no-cache git curl build-base autoconf automak 0.0s
=> CACHED [grpc-web 1/2] RUN cd /tmp && git clone --depth 1 --branch 1.2.1 https://github 0.0s
=> ERROR [grpc-web 2/2] RUN cd /tmp/grpc-web && make plugin -j 4 && make install-plug 0.4s
------
> [grpc-web 2/2] RUN cd /tmp/grpc-web && make plugin -j 4 && make install-plugin -j 4:
#7 0.337 cd "/tmp/grpc-web"/javascript/net/grpc/web && make
#7 0.338 make[1]: warning: jobserver unavailable: using -j1. Add '+' to parent make rule.
#7 0.340 make[1]: Entering directory '/tmp/grpc-web/javascript/net/grpc/web'
#7 0.340 g++ -std=c++11 -I/usr/local/include -pthread -c -o grpc_generator.o grpc_generator.cc
#7 0.354 grpc_generator.cc:19:10: fatal error: google/protobuf/compiler/code_generator.h: No such file or directory
#7 0.354 19 | #include
#7 0.354 | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#7 0.354 compilation terminated.
#7 0.358 make[1]: *** [: grpc_generator.o] Error 1
#7 0.358 make[1]: Leaving directory '/tmp/grpc-web/javascript/net/grpc/web'
#7 0.358 make: *** [Makefile:102: plugin] Error 2
------
executor failed running [/bin/sh -c cd /tmp/grpc-web && make plugin -j 4 && make install-plugin -j 4]: exit code: 2
```