Extract XML example from Maven plugin adoc file

See gh-25993

spring-boot-project/spring-boot-tools/spring-boot-maven-plugin/src/docs/asciidoc/packaging-oci-image.adoc

@@ -243,26 +243,9 @@ The buildpack-provided `JAVA_TOOL_OPTIONS` value can be modified to customize JV
 
 Environment variable modifications that should be stored in the image and applied to every deployment can be set as described in the {paketo-reference}/buildpacks/configuration/#environment-variables[Paketo documentation] and shown in the following example:
 
-[source,xml,indent=0,subs="verbatim,attributes"]
+[source,xml,indent=0,subs="verbatim,attributes",tabsize=4]
 ----
-	<project>
-		<build>
-			<plugins>
-				<plugin>
-					<groupId>org.springframework.boot</groupId>
-					<artifactId>spring-boot-maven-plugin</artifactId>
-					<configuration>
-						<image>
-							<env>
-								<BPE_DELIM_JAVA_TOOL_OPTIONS xml:space="preserve"> </BPE_DELIM_JAVA_TOOL_OPTIONS>
-								<BPE_APPEND_JAVA_TOOL_OPTIONS>-XX:+HeapDumpOnOutOfMemoryError</BPE_APPEND_JAVA_TOOL_OPTIONS>
-							</env>
-						</image>
-					</configuration>
-				</plugin>
-			</plugins>
-		</build>
-	</project>
+include::../maven/packaging-oci-image/runtime-jvm-configuration-pom.xml[tags=runtime-jvm-configuration]
 ----
 
 

spring-boot-project/spring-boot-tools/spring-boot-maven-plugin/src/docs/maven/packaging-oci-image/runtime-jvm-configuration-pom.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<!-- tag::runtime-jvm-configuration[] -->
+<project>
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+				<configuration>
+					<image>
+						<env>
+							<BPE_DELIM_JAVA_TOOL_OPTIONS xml:space="preserve"> </BPE_DELIM_JAVA_TOOL_OPTIONS>
+							<BPE_APPEND_JAVA_TOOL_OPTIONS>-XX:+HeapDumpOnOutOfMemoryError</BPE_APPEND_JAVA_TOOL_OPTIONS>
+						</env>
+					</image>
+				</configuration>
+			</plugin>
+		</plugins>
+	</build>
+</project>
+<!-- end::runtime-jvm-configuration[] -->
+