[docker] Avoid hardcoding the static file container source
In the NGINX image.
# Welcome to Hue NGINX (http://gethue.com) Dockerfile
+ARG registry=gethue
+ARG tag=latest
+
+FROM ${registry}/hue:${tag} as base
+
FROM nginx
-LABEL description="Host files of Hue"
+LABEL description="Static files of Hue service"
-COPY --from=gethue/hue:latest /usr/share/hue/build/static/ /usr/share/nginx/html/hue/static
+COPY --from=base /usr/share/hue/build/static/ /usr/share/nginx/html/hue/static
RUN rm /etc/nginx/conf.d/default.conf
