docker: Use golang image as proxylib builder

This is to allow auto image update.

Signed-off-by: Tam Mach <tam.mach@cilium.io>

Dockerfile

@@ -3,9 +3,7 @@
 #
 ARG BUILDER_BASE=quay.io/cilium/cilium-envoy-builder:6.1.0-latest
 
-# Common Builder image used in cilium/cilium
-# We need gcc for cgo cross-compilation at least, we can swap to something smaller later on
-ARG PROXYLIB_BUILDER=quay.io/cilium/cilium-builder:832f86bb0f7c7129c1536d5620174deeec645117@sha256:6dbac9f9eba3e20f8edad4676689aa8c11b172035fe5e25b533552f42dea4e9a
+ARG PROXYLIB_BUILDER=docker.io/library/golang:1.21.3@sha256:24a09375a6216764a3eda6a25490a88ac178b5fcb9511d59d0da5ebf9e496474
 
 #
 # ARCHIVE_IMAGE defaults to the result of the first stage below,
@@ -22,6 +20,29 @@ FROM --platform=$BUILDPLATFORM $PROXYLIB_BUILDER as proxylib
 WORKDIR /go/src/github.com/cilium/proxy
 ARG TARGETARCH
 ENV TARGETARCH=$TARGETARCH
+RUN \
+    apt-get update && \
+    apt-get upgrade -y --no-install-recommends && \
+    apt-get install -y --no-install-recommends \
+      # Install cross tools for both arm64 on amd64
+      gcc-aarch64-linux-gnu \
+      g++-aarch64-linux-gnu \
+      libc6-dev-arm64-cross \
+      binutils-aarch64-linux-gnu \
+      gcc-x86-64-linux-gnu \
+      g++-x86-64-linux-gnu \
+      libc6-dev-amd64-cross \
+      binutils-x86-64-linux-gnu \
+      binutils \
+      coreutils \
+      curl \
+      gcc \
+      git \
+      libc6-dev \
+      make && \
+    apt-get purge --auto-remove && \
+    apt-get clean && \
+    rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 RUN --mount=type=bind,readwrite,target=/go/src/github.com/cilium/proxy --mount=mode=0777,target=/cilium/proxy/.cache,type=cache --mount=mode=0777,target=/go/pkg,type=cache \
     GOARCH=${TARGETARCH} make -C proxylib all && mv proxylib/libcilium.so /tmp/libcilium.so