pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>cra.war.examples</groupId>
    <artifactId>cra-maven-war</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <npm.output.directory>build</npm.output.directory>
    </properties>

    <build>
        <finalName>${project.artifactId}</finalName>
        <plugins>
            <!-- Standard plugin to generate WAR -->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-war-plugin</artifactId>
                <version>2.1.1</version>
                <configuration>
                    <webResources>
                        <resource>
                            <directory>${npm.output.directory}</directory>
                        </resource>
                    </webResources>
                    <webXml>${basedir}/web.xml</webXml>
                </configuration>
            </plugin>
        </plugins>
    </build>

    <profiles>
        <profile>
            <id>local</id>
            <activation>
                <activeByDefault>true</activeByDefault>
            </activation>
            <build>
                <plugins>
                    <plugin>
                        <groupId>org.codehaus.mojo</groupId>
                        <artifactId>exec-maven-plugin</artifactId>
                        <configuration>
                            <environmentVariables>
                                <PUBLIC_URL>http://localhost:8080/${project.artifactId}</PUBLIC_URL>
                            </environmentVariables>
                        </configuration>
                    </plugin>
                </plugins>
            </build>
        </profile>

        <profile>
            <id>prod</id>
            <build>
                <plugins>
                    <plugin>
                        <groupId>org.codehaus.mojo</groupId>
                        <artifactId>exec-maven-plugin</artifactId>

                        <configuration>
                            <environmentVariables>
                                <PUBLIC_URL>http://my-awesome-production-host/${project.artifactId}</PUBLIC_URL>
                            </environmentVariables>
                        </configuration>
                    </plugin>
                </plugins>
            </build>
        </profile>
    </profiles>
</project>