build agent

Dockerfile

@@ -18,6 +18,8 @@ RUN set -eux; \
   mkdir -p /freebsd-sysroot; \
   tar -xJf base.txz -C /freebsd-sysroot ./lib ./usr/include ./usr/lib
 
+FROM golang:1.26-bookworm AS go-toolchain
+
 FROM rockylinux:9
 
 ARG RUST_TOOLCHAIN=stable
@@ -68,8 +70,12 @@ RUN set -eux; \
   rustc "+${FREEBSD_RUST_TOOLCHAIN}" --version
 
 COPY --from=freebsd-sysroot /freebsd-sysroot /opt/freebsd-sysroot
+COPY --from=go-toolchain /usr/local/go /usr/local/go
 
-ENV FREEBSD_RUST_TOOLCHAIN=${FREEBSD_RUST_TOOLCHAIN} \
+ENV PATH=/usr/local/go/bin:${PATH} \
+  GOPATH=/var/lib/package-builder/go \
+  GOCACHE=/var/lib/package-builder/go/cache \
+  FREEBSD_RUST_TOOLCHAIN=${FREEBSD_RUST_TOOLCHAIN} \
   CARGO_TARGET_X86_64_UNKNOWN_FREEBSD_LINKER=clang \
   CC_x86_64_unknown_freebsd=clang \
   CXX_x86_64_unknown_freebsd=clang++ \