Merge protoc generator dockerfile into generator.Dockerfile (#499)

Author: mariomac

Dockerfile

@@ -1,5 +1,4 @@
 # Build the autoinstrumenter binary
-# TODO: replace by OTEL image once they are uploaded
 FROM ghcr.io/open-telemetry/obi-generator:0.1.1@sha256:3575058c6e7fa5346e62eef608f197802e8771f53bd2070e01751175c639c31d AS builder
 
 # TODO: embed software version in executable

generator.Dockerfile

@@ -13,12 +13,35 @@ FROM base AS dist
 WORKDIR /src
 
 ENV EBPF_VER=v0.19.0
+ENV PROTOC_VERSION=32.0
+ARG TARGETARCH
 
-RUN apk add clang llvm20 wget
+RUN apk add clang llvm20 wget unzip curl
 RUN apk cache purge
+
+# Install protoc
+# Deal with the arm64==aarch64 ambiguity
+RUN if [ "$TARGETARCH" = "arm64" ]; then \
+        curl -qL https://github.com/protocolbuffers/protobuf/releases/download/v${PROTOC_VERSION}/protoc-${PROTOC_VERSION}-linux-aarch_64.zip -o protoc.zip; \
+    else \
+        curl -qL https://github.com/protocolbuffers/protobuf/releases/download/v${PROTOC_VERSION}/protoc-${PROTOC_VERSION}-linux-x86_64.zip -o protoc.zip; \
+    fi
+RUN unzip protoc.zip -d /usr/local
+RUN rm protoc.zip
+
+# Install protoc-gen-go and protoc-gen-go-grpc
+RUN go install google.golang.org/protobuf/cmd/protoc-gen-go@latest
+RUN go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@latest
+
+# Install eBPF tools
 RUN go install github.com/cilium/ebpf/cmd/bpf2go@$EBPF_VER
 COPY --from=builder /build/obi_genfiles /go/bin
 
+# Verify installations
+RUN protoc --version
+RUN protoc-gen-go --version  
+RUN protoc-gen-go-grpc --version
+
 RUN cat <<EOF > /generate.sh
 #!/bin/sh
 export GOCACHE=/tmp