Support Application-Based Cookies

[lgants]

what

• This PR adds support for the optional cookie_name stickiness block parameter
• This PR also adds a verification check in the variables file - this functionality requires terraform version 0.13, which is consistent with existing version requirements for this module

why

• This module should support application-based cookies. The AWS documentation states that, "Application Load Balancers support both duration-based cookies and application-based cookies. The key to managing sticky sessions is determining how long your load balancer should consistently route the user's request to the same target. Sticky sessions are enabled at the target group level. You can use a combination of duration-based stickiness, application-based stickiness, and no stickiness across all of your target groups." - source: https://docs.aws.amazon.com/elasticloadbalancing/latest/application/sticky-sessions.html.

references

ALB Terraform ALB target group stickiness configuration: https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/lb_target_group#stickiness

This Pull Request has been updated, so we're dismissing all reviews.

[nitrocode]

/test all

test errors

[nitrocode]

/test all

[goruha]

/terratest

[abeluck]

We also need this feature for some applications, is there a reason this wasn't merged originally?

@osterman @goruha @nitrocode could we please get a review of this again?

I've rebased the changes in my own branch here and it works fine!

main...abeluck:terraform-aws-alb-ingress:feat/application-cookies

I could open up a new PR if @lgants isn't around to update this PR, just let me know.

[nitrocode]

@abeluck there are conflicts in this PR. If the author can resolve the conflicts, someone can review. Or the pr can be recreated with the conflicts fixed.

[abeluck]

@abeluck there are conflicts in this PR. If the author can resolve the conflicts, someone can review. Or the pr can be recreated with the conflicts fixed.

@nitrocode Thanks for getting back! Since I'm not the original author, I've opened a new PR with the same changes here (less merge conflicts of course).

#95