fixed protoc-plugin build failure

net/grpc/gateway/docker/prereqs/Dockerfile

@@ -22,7 +22,7 @@
 FROM buildpack-deps:bullseye AS prepare
 
 ARG BUILDIFIER_VERSION=1.0.0
-ARG PROTOBUF_VERSION=3.19.4
+ARG PROTOBUF_VERSION=27.1
 
 RUN apt-get -qq update && apt-get -qq install -y curl unzip
 
@@ -45,6 +45,8 @@ RUN git clone https://github.com/grpc/grpc-web .
 COPY ./scripts/init_submodules.sh ./scripts/
 RUN ./scripts/init_submodules.sh
 
+# Add this to ensure abseil-cpp is available
+RUN git clone --depth 1 https://github.com/abseil/abseil-cpp.git third_party/abseil-cpp
 
 ######################################
 # Stage 2: Copy source files and build

net/grpc/gateway/docker/protoc_plugin/Dockerfile

@@ -17,24 +17,28 @@ FROM grpcweb/prereqs
 ARG MAKEFLAGS=-j8
 
 RUN apt-get -qq update && apt-get -qq install -y \
-  autoconf \
-  automake \
-  build-essential \
-  curl \
-  git \
-  libtool \
-  libssl-dev \
-  make \
-  zip
+  cmake ninja-build \
+  pkg-config \
+  zlib1g-dev && \
+  rm -rf /var/lib/apt/lists/*
 
 WORKDIR /github/grpc-web
 
-RUN cd ./third_party/protobuf && \
-  ./autogen.sh && \
-  ./configure && \
-  make && \
-  make install && \
-  ldconfig
+# Copy full source (including third_party)
+COPY . /github/grpc-web
 
-RUN cd ./javascript/net/grpc/web/generator && \
-  make protoc-gen-grpc-web
+RUN rm -rf /usr/local/include/absl /usr/local/lib/libabsl*
+
+WORKDIR /github/grpc-web/third_party/abseil-cpp
+RUN cmake -S . -B cmake/build \
+      -DCMAKE_POSITION_INDEPENDENT_CODE=ON \
+      -DCMAKE_BUILD_TYPE=Release && \
+    cmake --build cmake/build --target install
+
+WORKDIR /github/grpc-web/third_party/protobuf
+RUN cmake -S . -B cmake/build \
+      -DCMAKE_BUILD_TYPE=Release \
+      -Dprotobuf_BUILD_TESTS=OFF \
+      -DCMAKE_POSITION_INDEPENDENT_CODE=ON \
+      -DCMAKE_CXX_STANDARD=17 && \
+    cmake --build cmake/build --target install

scripts/init_submodules.sh

@@ -16,4 +16,4 @@ set -ex
 
 cd "$(dirname "$0")"/..
 git submodule --quiet update --init --recursive
-(cd third_party/protobuf && git checkout tags/v3.15.6)
+(cd third_party/protobuf && git checkout tags/v27.1)