update deployment model for Spring Boot example with Open Liberty

Author: rieckpil

spring-boot-with-open-liberty/Dockerfile

@@ -0,0 +1,3 @@
+FROM open-liberty:kernel
+COPY server.xml /config/
+COPY target/spring-boot-with-open-liberty.jar /config/apps/

spring-boot-with-open-liberty/README.md

@@ -5,23 +5,7 @@ Steps to run this project:
 1. Clone this Git repository
 2. Navigate to the folder `spring-boot-with-open-liberty`
 3. Build the project with `mvn clean package`
-4. Download the latest Open Liberty (at least 18.0.0.2) from https://openliberty.io/downloads/ and extract the zip 
-5. Navigate to the `wlp` folder you extracted and run `bin/server start defaultServer` or `bin/server.bat start defaultServer` for Windows
-6. Open the `server.xml` file in `wlp/usr/server/defaultServer` and replace the content with the following configuration:
-```
-<?xml version="1.0" encoding="UTF-8"?>
-<server description="new server">
-    <featureManager>
-        <feature>springBoot-2.0</feature>
-        <feature>servlet-4.0</feature>
-        <feature>websocket-1.1</feature>
-    </featureManager>
-    <httpEndpoint id="defaultHttpEndpoint"
-                  httpPort="9080"
-                  httpsPort="9443" />
-    <applicationManager autoExpand="true"/>
-    <springBootApplication location="spring-boot-with-open-liberty.jar"/>
-</server>
-```
-7. Copy the already built (step 3.) `spring-boot-with-open-liberty.jar` to `wlp/usr/server/defaultServer/apps`
-8. Visit `http://localhost:9080` for chatting and `http://localhost:9080/api/messages` to get all chat messages
+4. Start your Docker daemon
+5. Run `docker build -t spring-liberty .`
+6. Run `docker run -p 9080:9080 spring-liberty` and wait until the applications successfully booted
+7. Visit `http://localhost:9080` for chatting and `http://localhost:9080/api/messages` to get all chat messages

spring-boot-with-open-liberty/server.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<server description="new server">
+    <featureManager>
+        <feature>springBoot-2.0</feature>
+        <feature>servlet-4.0</feature>
+        <feature>websocket-1.1</feature>
+    </featureManager>
+    <httpEndpoint id="defaultHttpEndpoint"
+                  httpPort="9080"
+                  httpsPort="9443" />
+    <applicationManager autoExpand="true"/>
+    <springBootApplication location="spring-boot-with-open-liberty.jar"/>
+</server>