docs(example): update ngrx.io for docker and offline support (ngrx#1806)

Closes ngrx#1698

Author: edenhermelin

.dockerignore

@@ -0,0 +1,7 @@
+node_modules
+npm-debug.log
+Dockerfile*
+docker-compose*
+.dockerignore
+.git
+.gitignore

Dockerfile

@@ -0,0 +1,15 @@
+FROM node:10.15.3
+
+# Create app directory
+WORKDIR /platform
+
+COPY . .
+
+WORKDIR /platform/projects/ngrx.io	
+
+# Install all the dependencies, boilerplate, stackblitz, zips and run dgeni on the docs.
+RUN yarn setup
+
+EXPOSE 4200
+
+CMD ["yarn", "start:docker"]

projects/ngrx.io/README.md

@@ -52,6 +52,19 @@ Running `yarn start` (even when explicitly targeting production mode) does not s
 ServiceWorker. If you want to test the ServiceWorker locally, you can use `yarn build` and then
 serve the files in `dist/` with `yarn http-server dist -p 4200`.
 
+## Running on Docker
+
+The ngrx.io sample project can run as a docker container. 
+In order to run ngrx.io on docker, use the following commands (**run commands from the platform folder**):
+* `docker build -t ngrx-docs:7.4.0 .` - building the ngrx.io app image
+* `docker run -p <host-port>:4200 ngrx-docs:7.4.0` - starting the container, listening on *<host-port>* for your choice.
+
+The container will run the documentation app with the script `start:docker` with the **stable configuration** and with 0.0.0.0
+host support.
+* Saving the image for later offline usage is available by building the container and then using `sudo docker save ngrx-docs:7.4.0 > <tar-name>.tar`
+and loading it afterwards with `sudo docker load < <tar-name>.tar`.
+> tested on ubuntu 18.04.2 with Docker 18.09.4
+
 ## Guide to authoring
 
 There are two types of content in the documentation:

projects/ngrx.io/package.json

@@ -12,6 +12,7 @@
     "aio-check-local": "node tools/ng-packages-installer check .",
     "ng": "yarn check-env && ng",
     "start": "yarn check-env && ng serve --configuration=fast",
+    "start:docker": "yarn check-env && ng serve --configuration=stable --host 0.0.0.0",
     "build": "yarn build-for stable",
     "prebuild-for": "yarn setup",
     "build-for": "yarn ~~build --configuration",