Fixed missing go in go-md2man

Author: nicholasdille

tools/go-md2man/Dockerfile.template

@@ -5,6 +5,7 @@ ARG ref=main
 FROM ghcr.io/nicholasdille/docker-setup/go:${ref} AS go
 
 FROM ghcr.io/nicholasdille/docker-setup/base:${ref} AS prepare
+COPY --link --from=go / /
 RUN <<EOF
 apt-get update
 apt-get -y install \