Allow dashes in var names

[monder]

I don't really know in which direction to fix it:

• AWS fingerprinting (env_aws.go#L111) sets the variables with dashes.
• Replacement regexp does not allow dashes in names.

Now there is no way to pass variables like platform.aws.placement.availability-zone, unique.platform.aws.local-ipv4 to the process.
Maybe lets allow it?

[dadgar]

Looks great thanks for the fix.

[github-actions]

I'm going to lock this pull request because it has been closed for 120 days ⏳. This helps our maintainers find and focus on the active contributions.
If you have found a problem that seems related to this change, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.