update code

laradock/laravel-echo-server/Dockerfile

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+FROM node:alpine
+
+# Create app directory
+RUN mkdir -p /usr/src/app
+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
+COPY laravel-echo-server.json /usr/src/app/laravel-echo-server.json
+
+EXPOSE 3000
+CMD [ "npm", "start", "--force" ]