new: added ``yaml2json`` to docker image mainly for usage in charms

First charm needing that is ``cyclos-ui``.

Signed-off-by: Valentin Lab <valentin.lab@kalysto.org>

Dockerfile

@@ -125,6 +125,11 @@ RUN apk add openssh-client
 ## handy in some charms to poke at some services
 RUN apk add curl
 
+## handy yaml2json converter for charm
+RUN wget https://github.com/bronze1man/yaml2json/releases/download/v1.3/yaml2json_linux_amd64 \
+    -O /usr/local/bin/yaml2json && \
+    chmod +x /usr/local/bin/yaml2json
+
 ## install compose
 COPY ./bin/ /usr/local/bin/