[Feature] Do not launch update checks at startup

[Skuair]

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I've found a bug and checked that ...

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Description

At container startup, Diun lauches the update check, as it is explained in the comment #833 (comment).
In my use case, my container is stopped every night because installed on Synolog NAS that shutdown every night, and every morning Diun check updates, despite i set it up to check only on sundays.

Expected behaviour

Add a new config parameter to activate or not the run at startup in addition with the cron trigger.

Actual behaviour

Run is launched at startup and when triggered by cron.

Steps to reproduce

1. Start Diun container
2. Check is done immediatly even if the moment does not satisfy the cron

Diun version

4.24.0

Docker info

Client:
 Context:    default
 Debug Mode: false

Server:
 Containers: 17
  Running: 15
  Paused: 0
  Stopped: 2
 Images: 33
 Server Version: 20.10.3
 Storage Driver: btrfs
  Build Version: Btrfs v4.0
  Library Version: 101
 Logging Driver: db
 Cgroup Driver: cgroupfs
 Cgroup Version: 1
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs db fluentd gcplogs gelf journald json-file local logentries splunk syslog
 Swarm: inactive
 Runtimes: io.containerd.runc.v2 io.containerd.runtime.v1.linux runc
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: 3fa00912415f3e9c6f82dd72119179d599efd13b
 runc version: 31cc25f16f5eba4d0f53e35374532873744f4b31
 init version: ed96d00 (expected: de40ad0)
 Security Options:
  apparmor
 Kernel Version: 4.4.180+
 OSType: linux
 Architecture: x86_64
 CPUs: 2
 Total Memory: 5.641GiB
 Name: SkuairStation
 ID: DGMR:ZSA2:HDUM:REYZ:EILQ:YXMF:IW7K:XNCW:LDI7:CT6U:NSZS:DKGV
 Docker Root Dir: /volume1/@docker
 Debug Mode: false
 Registry: https://index.docker.io/v1/
 Labels:
 Experimental: false
 Insecure Registries:
  127.0.0.0/8
 Live Restore Enabled: false

Docker Compose config

No response

Logs

2023-06-08T05:33:43.375570918Z | stdout | �[90mThu, 08 Jun 2023 07:33:43 CEST�[0m �[32mINF�[0m Next run in 2 days 16 hours (2023-06-11 00:30:09.977184317 +0200 CEST)
-- | -- | --
2023-06-08T05:33:43.375482822Z | stdout | �[90mThu, 08 Jun 2023 07:33:43 CEST�[0m �[32mINF�[0m Cron initialized with schedule 30 0 * * 0
2023-06-08T05:33:43.375026847Z | stdout | �[90mThu, 08 Jun 2023 07:33:43 CEST�[0m �[32mINF�[0m Jobs completed �[36madded=�[0m0 �[36mfailed=�[0m0 �[36mskipped=�[0m0 �[36munchanged=�[0m13 �[36mupdated=�[0m2
2023-06-08T05:33:21.636264725Z | stdout | �[90mThu, 08 Jun 2023 07:33:21 CEST�[0m �[32mINF�[0m Image update found �[36mimage=�[0mdocker.io/linuxserver/pyload-ng:latest �[36mprovider=�[0mdocker
2023-06-08T05:33:21.143026694Z | stdout | �[90mThu, 08 Jun 2023 07:33:21 CEST�[0m �[32mINF�[0m Image update found �[36mimage=�[0mdocker.io/gitea/gitea:latest �[36mprovider=�[0mdocker
2023-06-08T05:33:17.557081854Z | stdout | �[90mThu, 08 Jun 2023 07:33:17 CEST�[0m �[32mINF�[0m Found 15 image(s) to analyze �[36mprovider=�[0mdocker
2023-06-08T05:33:02.548833910Z | stdout | �[90mThu, 08 Jun 2023 07:33:02 CEST�[0m �[32mINF�[0m Cron triggered
2023-06-08T05:32:59.547710032Z | stdout | �[90mThu, 08 Jun 2023 07:32:59 CEST�[0m �[32mINF�[0m Configuration loaded from 1 environment variable(s)
2023-06-08T05:32:59.547617557Z | stdout | �[90mThu, 08 Jun 2023 07:32:59 CEST�[0m �[32mINF�[0m Configuration loaded from file: /diun.yml
2023-06-08T05:32:59.106430652Z | stdout | �[90mThu, 08 Jun 2023 07:32:59 CEST�[0m �[32mINF�[0m Starting Diun �[36mversion=�[0mv4.24.0
2023-06-07T23:00:22.571237010Z | stdout | �[90mThu, 08 Jun 2023 01:00:22 CEST�[0m �[31mWRN�[0m Caught signal terminated

Additional info

No response

[Skuair]

Thanks for the add.