How to copy a resource or another in Maven depending on the target environment?

Create a “dev” and “prod” profile, selecting an alternate set of resources for each profile. Make Dev active by default.

<profiles>
    <profile>
        <id>dev</id>
        <activation>
            <activeByDefault>true</activeByDefault>
        </activation>
        <build>
            <resources>
                <resource>
                    <directory>src/main/resources/dev</directory>
                </resource>
            </resources>
        </build>
    </profile>
    <profile>
        <id>prod</id>
        <build>
            <resources>
                <resource>
                    <directory>src/main/resources/prod</directory>
                </resource>
            </resources>
        </build>
    </profile>
</profiles>

Build using the desired profile via:
mvn install -Pdev
or
mvn install -Pprod