Add out of support within days config

[IEvangelist]

Added a config value that will allow us to specify the number of additional days to consider flagging versions that will be out of support. For example:

{
  "outOfSupportWithinDays": 90,
  "ignore": [
    "**/pinned-versions/**",
    "**/*.fsproj"
  ]
}

This will flag all out of support versions, but also versions that will be out of support 90 days from now.

[BillWagner]

This LGTM @IEvangelist

You can when ready.

[Gakk]

@IEvangelist This flag is not documented in neither README.md nor action.yml. Is it still working, or has it been removed later?

EDIT: I now discovered that this value is in the json-file. I would really love if this could be a normal optional input to the action, instead of creating a new file.

[IEvangelist]

Good catch, @Gakk. Thanks for calling attention to this. Are you using this GitHub Action?

[Gakk]

I am product manager for a double digit number of products, and have for a long time used Dependabot to help manage both package upgrades and newer versions of actions.

A short while ago I looked at a .NET repository and noticed it used your action to check target version for projects.

When using a new product/package I usually read through release notes, issues and pull request to get a feeling on how the product is evolving and being maintained. That's when I noticed this feature for number of days 😇