Added dockerfile and devfile to sample application

Signed-off-by: eyuen <[email protected]>

Author: elsony

.dockerignore

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+target/*
+!target/*-SNAPSHOT.jar

.gitignore

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+.classpath
+.project
+.settings
+target
+.odo/env

HELP.md

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+# Getting Started
+
+### Reference Documentation
+For further reference, please consider the following sections:
+
+* [Official Apache Maven documentation](https://maven.apache.org/guides/index.html)
+* [Spring Boot Maven Plugin Reference Guide](https://docs.spring.io/spring-boot/docs/2.3.5.RELEASE/maven-plugin/reference/html/)
+* [Create an OCI image](https://docs.spring.io/spring-boot/docs/2.3.5.RELEASE/maven-plugin/reference/html/#build-image)
+

devfile.yaml

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+schemaVersion: 2.0.0
+metadata:
+  name: java-springboot
+  version: 1.1.0
+  attributes:
+  alpha.build-context: .
+  alpha.build-dockerfile: docker/Dockerfile
+  displayName: Java Spring Boot
+  description: Java Spring Boot using Maven
+  tags: ["Java", "Spring"]
+  projectType: "springboot"
+  language: "java"
+starterProjects:
+  - name: springbootproject
+    git:
+      remotes:
+        origin: "https://github.com/odo-devfiles/springboot-ex.git"
+components:
+    - name: buildguidance
+    attributes:
+      tool: console-import
+    container:
+      image: buildguidanceimage-placeholder
+      memoryLimit: 1024Mi
+      endpoints:
+        - name: http-8080
+          targetPort: 8080
+  - name: tools
+    container:
+      image: quay.io/eclipse/che-java11-maven:nightly
+      memoryLimit: 768Mi
+      mountSources: true
+      endpoints:
+      - name: '8080-tcp'
+        targetPort: 8080
+      volumeMounts:
+        - name: m2
+          path: /home/user/.m2
+  - name: m2
+    volume:
+      size: 3Gi
+commands:
+  - id: build
+    exec:
+      component: tools
+      commandLine: "mvn clean -Dmaven.repo.local=/home/user/.m2/repository package -Dmaven.test.skip=true"
+      group:
+        kind: build
+        isDefault: true
+  - id: run
+    exec:
+      component: tools
+      commandLine: "mvn -Dmaven.repo.local=/home/user/.m2/repository spring-boot:run"
+      group:
+        kind: run
+        isDefault: true
+  - id: debug
+    exec:
+      component: tools
+      commandLine: "java -Xdebug -Xrunjdwp:server=y,transport=dt_socket,address=${DEBUG_PORT},suspend=n -jar target/*.jar"
+      group:
+        kind: debug
+        isDefault: true

docker/Dockerfile

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+####
+# This Dockerfile is used in order to build a container that runs the Spring Boot application
+#
+# Build the image with:
+#
+# docker build -f docker/Dockerfile -t springboot/springboot-basic .
+#
+# Then run the container using:
+#
+# docker run -i --rm -p 8080:8080 springboot/springboot-basic
+####
+FROM quay.io/eclipse/che-java11-maven:nightly
+
+WORKDIR /build
+# Build dependency offline to streamline build
+COPY pom.xml .
+RUN mvn dependency:go-offline
+
+COPY src src
+RUN mvn package -Dmaven.test.skip=true
+
+FROM openjdk:11-jdk
+COPY --from=0 /build/target/demo-0.0.1-SNAPSHOT.jar /app/target/demo-0.0.1-SNAPSHOT.jar
+
+EXPOSE 8080
+ENTRYPOINT [ "java", "-jar", "/app/target/demo-0.0.1-SNAPSHOT.jar" ]