Reduce cron logging level by default and allow environment override

[kenstir]

Description:

• Reduce cron logging level by default and allow environment override

Benefits of this PR and context:

Before this change, a linuxserver/qbittorrent:latest container run in Synology Container Manager would log multiple lines every minute. This made it hard to track down interesting and useful log messages.

Before:

2025-02-22T17:41:00.403267015Z crond[143]: wakeup dt=60
2025-02-22T17:41:00.403730420Z crond[143]: file root:
2025-02-22T17:41:00.403768954Z crond[143]:  line run-parts /etc/periodic/15min
2025-02-22T17:41:00.403805925Z crond[143]:  line run-parts /etc/periodic/hourly
2025-02-22T17:41:00.403838763Z crond[143]:  line run-parts /etc/periodic/daily
2025-02-22T17:41:00.403867506Z crond[143]:  line run-parts /etc/periodic/weekly
2025-02-22T17:41:00.403896633Z crond[143]:  line run-parts /etc/periodic/monthly
2025-02-22T17:42:00.403677263Z crond[143]: wakeup dt=60
2025-02-22T17:42:00.404104919Z crond[143]: file root:
2025-02-22T17:42:00.404149538Z crond[143]:  line run-parts /etc/periodic/15min
2025-02-22T17:42:00.404184588Z crond[143]:  line run-parts /etc/periodic/hourly
2025-02-22T17:42:00.404217121Z crond[143]:  line run-parts /etc/periodic/daily
2025-02-22T17:42:00.404250163Z crond[143]:  line run-parts /etc/periodic/weekly
2025-02-22T17:42:00.404283776Z crond[143]:  line run-parts /etc/periodic/monthly

After:

2025-02-22T18:00:00.164428156Z crond[177]: USER root pid 248 cmd run-parts /etc/periodic/15min
2025-02-22T18:00:00.165065698Z crond[177]: USER root pid 249 cmd run-parts /etc/periodic/hourly

How Has This Been Tested?

• Built this mod and pushed it to docker hub
• Restarted the container with env DOCKER_MODS=docker.io/kenstir/alpine-quieter-cron:latest
• Observed quieter logs

2025-02-22T17:46:56.485663276Z [mod-init] Adding kenstir/alpine-quieter-cron:latest to container
2025-02-22T17:46:56.839723354Z [mod-init] Downloading kenstir/alpine-quieter-cron:latest from registry-1.docker.io
2025-02-22T17:46:57.034326995Z [mod-init] Installing kenstir/alpine-quieter-cron:latest
2025-02-22T17:46:57.046603271Z [mod-init] kenstir/alpine-quieter-cron:latest applied to container
...
2025-02-22T17:46:58.179792352Z [ls.io-init] done.
2025-02-22T18:00:00.164428156Z crond[177]: USER root pid 248 cmd run-parts /etc/periodic/15min
2025-02-22T18:00:00.165065698Z crond[177]: USER root pid 249 cmd run-parts /etc/periodic/hourly
2025-02-22T18:15:00.167862812Z crond[177]: USER root pid 255 cmd run-parts /etc/periodic/15min

[kenstir]

Sorry, I forgot to ask the team: If you agree with the rationale for this PR, then please create a branch universal-quieter-cron and I will retarget the PR.

[LinuxServer-CI]

This pull request has been automatically marked as stale because it has not had recent activity. This might be due to missing feedback from OP. It will be closed if no further activity occurs. Thank you for your contributions.