Inform users when a new version is available

[rquadling]

Running 0.17 via pre-commit-terraform on a 0.13 terraform setup says that the variable validation is experimental which it isn't in terraform 0.13.

It would be useful to know have tflint inform us of a new version as it is not always easy to remember what tools work with what version.

Terraform lets you know of a new release even though you haven't update terraform. That pattern would be extremely useful.

[bendrucker]

FWIW Terraform tells you this only when you run terraform version, and it looks like this:

Your version of Terraform is out of date! The latest version
is 0.13.0. You can update by downloading from https://www.terraform.io/downloads.html

That much definitely seems doable/useful, via a GitHub releases API call, with a download link. Is that what you have in mind?

[rquadling]

Exactly what I poorly described.

Each week I run a container build including a load of tools (some of which can only supply the latest build, no versioning). The pipeline then checks what's new (essentially running the --version check on the installed code) and reports back what has changed.

I then create tickets to do the upgrades of the codebases that require that tool. This way, I'm in control of what tools are used in the pipelines AND I get notified when there's a change.

This provides a far saner approach than "just install the latest in the pipeline" or doing nothing and then being years out of date.