Use Maven plugin and Paketo buildpack in actuator-webflux sample

Closes gh-165

Author: sdeleuze

spring-graalvm-native-samples/actuator-webflux/README.md

@@ -1,2 +1,7 @@
-# actuator-webflux
+Spring Boot project with Spring WebFlux and Spring Boot actuators.
 
+To build and run the native application packaged in a lightweight container:
+```
+./gradlew bootBuildImage
+docker-compose up
+```

spring-graalvm-native-samples/actuator-webflux/docker-compose.yml

@@ -0,0 +1,6 @@
+version: '3.1'
+services:
+  actuator-webflux:
+    image: actuator-webflux:0.0.1-SNAPSHOT
+    ports:
+      - "8080:8080"

spring-graalvm-native-samples/actuator-webflux/pom.xml

@@ -56,6 +56,14 @@
 			<plugin>
 				<groupId>org.springframework.boot</groupId>
 				<artifactId>spring-boot-maven-plugin</artifactId>
+				<configuration>
+					<image>
+						<builder>nebhale/native-image-builder:defer-to-application</builder>
+						<env>
+							<BP_BOOT_NATIVE_IMAGE>1</BP_BOOT_NATIVE_IMAGE>
+						</env>
+					</image>
+				</configuration>
 			</plugin>
 		</plugins>
 	</build>