Fixes laradock/laradock#/1245 by adding python to the image

laravel-echo-server/Dockerfile

@@ -6,6 +6,13 @@ WORKDIR /usr/src/app
 
 # Install app dependencies
 COPY package.json /usr/src/app/
+
+RUN apk add --update \
+    python \
+    python-dev \
+    py-pip \
+    build-base
+
 RUN npm install
 
 # Bundle app source