feat: optimize version output

[yxxhero]

Signed-off-by: yxxhero aiopsclub@163.com

▓▓▓ ./helmfile

  Version            0.145.4
  Git Commit         N/A
  Build Date         N/A
  Commit Date        N/A
  Dirty Build        no
  Go version         1.19
  Compiler           gc
  Platform           linux/amd64

  │ A new release is available: 0.145.4 → v0.146.0
  │ https://github.com/helmfile/helmfile/releases/tag/v0.146.0


[root@devops helmfile]# ./helmfile version -o json
{
  "buildDate": "N/A",
  "commitDate": "N/A",
  "compiler": "gc",
  "gitCommit": "N/A",
  "goVersion": "go1.19",
  "platform": "linux/amd64",
  "version": "0.145.4"
}

  │ A new release is available: 0.145.4 → v0.146.0
  │ https://github.com/helmfile/helmfile/releases/tag/v0.146.0

[mumoshu]

LGTM overall!
Can we also add a flag to disable the new version check feature for cases where helmfile is used in an isolated/restrictive environment with no internet access?

[yxxhero]

@mumoshu set HELMFILE_UPGRADE_NOTICE_DISABLED to any not empty value to disable upgrade notice behavior.

[mumoshu]

LGTM. Thank you as always for your effort!

[yxxhero]

@mumoshu fix the ci error. done.

[mumoshu]

Perfect! Thanks a bunch!