Installation of latest terragrunt version is not working anymore #385
Description
Installing the latest version of Terragrunt using tenv does not work anymore because it tries to install an invalid version.
> tenv tg install
No version files found for Terragrunt, fallback to latest strategy
Fetching all releases information from https://api.github.com/repos/gruntwork-io/terragrunt/releases
Found compatible version remotely : 2025031901
Installing Terragrunt 2025031901
Fetching release information from https://api.github.com/repos/gruntwork-io/terragrunt/releases/tags/v2025031901
Error: unexpected value returned by API
When digging further, I noticed that Gruntworks now publishes alpha releases of Terragrunt on Github which are considered by tenv by the latest. tenv terragrunt list-remote can be used to view this:
tenv terragrunt list-remote
[...]
0.76.7
0.76.8
0.77.0
0.77.1
2025022701
2025022702
2025022703
2025030401
2025031301
2025031901
You can also list the releases here: https://api.github.com/repos/gruntwork-io/terragrunt/releases
I suggest to implement some validation of the format of Terragrunt release tags required for tenv to consider them "valid". (e.g: semver regex validation)