Added frontend build script.

pom.xml

@@ -15,6 +15,8 @@
 	<description>Demo project for Spring Boot</description>
 	<properties>
 		<java.version>11</java.version>
+		<nodeVersion>v17.6.0</nodeVersion>
+		<npmVersion>7.20.6</npmVersion>
 	</properties>
 	<dependencies>
 		<dependency>
@@ -78,7 +80,62 @@
 					</excludes>
 				</configuration>
 			</plugin>
+			<plugin>
+				<groupId>com.github.eirslett</groupId>
+				<artifactId>frontend-maven-plugin</artifactId>
+				<version>1.11.3</version>
+				<configuration>
+					<nodeVersion>${nodeVersion}</nodeVersion>
+					<npmVersion>${npmVersion}</npmVersion>
+					<workingDirectory>src/main/webapp/</workingDirectory>
+				</configuration>
+				<executions>
+					<execution>
+						<id>install node and npm</id>
+						<goals>
+							<goal>install-node-and-npm</goal>
+						</goals>
+					</execution>
+					<execution>
+						<id>npm install</id>
+						<goals>
+							<goal>npm</goal>
+						</goals>
+					</execution>
+					<execution>
+						<id>prod</id>
+						<goals>
+							<goal>npm</goal>
+						</goals>
+						<configuration>
+							<arguments>run-script build</arguments>
+						</configuration>
+						<phase>generate-resources</phase>
+					</execution>
+				</executions>
+			</plugin>
+			<plugin>
+				<artifactId>maven-resources-plugin</artifactId>
+				<executions>
+					<execution>
+						<id>copy-resources</id>
+						<phase>process-resources</phase>
+						<goals>
+							<goal>copy-resources</goal>
+						</goals>
+						<configuration>
+							<outputDirectory>${project.build.directory}/classes/static</outputDirectory>
+							<resources>
+								<resource>
+									<directory>${project.basedir}/src/main/webapp/dist/demo
+									</directory>
+								</resource>
+							</resources>
+							<overwrite>true</overwrite>
+						</configuration>
+					</execution>
+				</executions>
+			</plugin>
 		</plugins>
 	</build>
-
 </project>