chg: dev: force ``pyyaml`` to use C bindings to boost ``shyaml``.

Dockerfile

@@ -52,7 +52,7 @@ RUN apk --update add binutils && \
 
 ## install shyaml
 RUN apk add python-dev build-base
-RUN apk add python-dev py-yaml && \
+RUN apk add yaml-dev cython cython-dev && \
     pip install shyaml
 
 RUN pip install docker-compose==$DOCKER_COMPOSE_VERSION
@@ -65,6 +65,14 @@ RUN curl -L https://git.0k.io/git-sub.git/plain/bin/git-sub > /usr/local/bin/git
 
 RUN curl http://docker.0k.io/get/ca.0k.io.pem > /usr/local/share/ca-certificates/ca.0k.io.pem
 
+##force install pyyaml with libyaml
+RUN cd /tmp && \
+    wget https://github.com/yaml/pyyaml/archive/4.1.tar.gz && \
+    tar xvzf 4.1.tar.gz && \
+    cd pyyaml-4.1 && \
+    PYTHONPATH=/usr/lib/python2.7/site-packages python setup.py --with-libyaml install
+
+
 
 FROM common