add go bin to path

docker/dev/Dockerfile2

@@ -4,15 +4,15 @@ ENV CRYPTOGRAPHY_DONT_BUILD_RUST=1
 
 RUN apk update && apk add --no-cache libffi-dev libressl-dev curl
 
-# install go package.
-RUN go install github.com/mingrammer/round@latest
-
 RUN pip install --user poetry
 
 WORKDIR /usr/src/diagrams
 
 RUN python -m unittest tests/*.py -v
 
+# add go bin to path.
+ENV PATH "$PATH:/root/go/bin"
+
 RUN ./autogen.sh
 
 RUN /root/.local/bin/poetry build