Fixed location of go-md2man

Author: nicholasdille

tools/go-md2man/Dockerfile.template

@@ -18,5 +18,5 @@ RUN git clone --config advice.detachedHead=false --depth 1 --branch "v${version}
 ENV CGO_ENABLED=0
 RUN make bin/go-md2man \
  && mv bin/go-md2man "${prefix}${target}/bin/"
-RUN go-md2man -in ./go-md2man.1.md -out ./go-md2man.1 \
+RUN "${prefix}${target}/bin/go-md2man" -in ./go-md2man.1.md -out ./go-md2man.1 \
  && mv go-md2man.1 "${prefix}${target}/share/man/man1/"