logging: provide ability to customize the RollingFile pattern

[jorgheymans]

In file-appender.xml I would like to disable just the gzip so that my log files stay more easily readable. It would be nice to have something like ${LOG_ROLLING_PATTERN} where i could redefine just this <fileNamePattern>${LOG_FILE}.%d{yyyy-MM-dd}.%i.gz</fileNamePattern>

	<appender name="FILE"
		class="ch.qos.logback.core.rolling.RollingFileAppender">
		<encoder>
			<pattern>${FILE_LOG_PATTERN}</pattern>
		</encoder>
		<file>${LOG_FILE}</file>
		<rollingPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy">
			<fileNamePattern>${LOG_FILE}.%d{yyyy-MM-dd}.%i.gz</fileNamePattern>
			<maxFileSize>${LOG_FILE_MAX_SIZE:-10MB}</maxFileSize>
			<maxHistory>${LOG_FILE_MAX_HISTORY:-0}</maxHistory>
		</rollingPolicy>
	</appender>

[eddumelendez]

due to #18151 was merged I think this issue can be closed

[wilkinsona]

Indeed it can. Thank you, @eddumelendez.