copying docker to image and building

Dockerfile

@@ -1,6 +1,9 @@
 FROM alpine:3.6
 
-RUN apk add --no-cache --update python py-pip py-lxml && \
-    pip install -r requirements.txt
+ADD ./docker /walle-react
+WORKDIR /walle-react
 
-cmd 'gunicorn --bind 0.0.0.0:3000 wsgi'
+RUN apk add --no-cache --update python py-pip py-lxml \
+    && pip install -r requirements.txt
+
+CMD gunicorn --bind 0.0.0.0:$PORT wsgi