BAEL-842 improvement to the spring controller return image or file in controller example: add a dynamic example

spring-boot-modules/spring-boot-mvc-3/pom.xml

@@ -40,6 +40,18 @@
             <artifactId>commons-io</artifactId>
             <version>${commons-io.version}</version>
         </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
+    <build>
+        <resources>
+            <resource>
+                <directory>/src/main/resources</directory>
+            </resource>
+        </resources>
+    </build>
 </project>