Logback I want File do not create when the appender is never used. [RollingFileAppender] - spring

Question

I'm creating a logback-common config file for my applis.
I'm defining a RollingFileAppender in it, that for all my applis generates the same log format in a file (if we need it).
Sometimes I want to use this appender, and sometimes not (when we test for example).
So we configure our specific logback-{profile}.xml depending what we want.
But when we do not use the FILE appender, the file gets created and I would like not.
I have:
logback-common.xml >> with all appenders definition (FILE and COMMON)
appli_one
resources/logback.xml >> call logback-common and config/logback-{profile}.xml
resources/config/logback-{profile}.xml >> specific appli/profile logback configuration.
To configure we can do in logback-{profile}.xml
<root level="WARN">
<appender-ref ref="FILE"/> <!-- For File Log when we need it -->
<appender-ref ref="CONSOLE"/>
</root>
<root level="WARN">
<!-- <appender-ref ref="FILE"/> --> <!-- in comment when we do not need if > BUT create a empty file -->
<appender-ref ref="CONSOLE"/>
</root>
logback-common.xml
<included>
<!-- The FILE and ASYNC appenders are here as examples for a production
configuration -->
<appender name="FILE"
class="ch.qos.logback.core.rolling.RollingFileAppender">
<file>log/${spring.application.name}.log</file>
<rollingPolicy
class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
<fileNamePattern>
log/${spring.application.name}.%d{yyyy-MM-dd}.%i.log.zip
</fileNamePattern>
<maxHistory>90</maxHistory>
<maxFileSize>10MB</maxFileSize>
</rollingPolicy>
<encoder>
<charset>utf-8</charset>
<Pattern>%d %-5level [%thread] %logger{0}: %msg%n</Pattern>
</encoder>
</appender>
<appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>"%d{yyyy-MM-dd} [%thread] %-5level %45logger{45} - %msg%n"</pattern>
</encoder>
</appender>
</included>
logback.xml
<?xml version="1.0" encoding="UTF-8"?>
<configuration scan="true" packagingData="true">
<property name="spring_profiles_active" value="${spring.profiles.active}" />
<property resource="application.properties"/>
<include resource="config/log/logback-common.xml"/>
<include resource="config/log/logback-${spring_profiles_active}.xml"/>
</configuration>

Answer 1

Not a core feature of logback but there are workarounds to achieve lazy file initialization.
See more here
Logback - do not create empty log files at startup