Support unique route table for outpost routes

[jonvadney]

Is your request related to a new offering from AWS?

No

Is your request related to a problem? Please describe.

Outpost support is currently available in the module, however the shared use of the private route table makes using the local gateway in an outpost problematic.

https://docs.aws.amazon.com/outposts/latest/userguide/outposts-networking-components.html

Describe the solution you'd like.

Options

1. Add an option to create a blank outpost route table, instead of using the private subnet route table. Would allow the module user to create the custom route rules outside of the module.
2. Add options similar to the database subnet for creation of the optional routes. Include support for the local gateway as one of the options.

In either case, also add an output for the outpost route table id's.

Describe alternatives you've considered.

Create the outpost subnets outside of this module.

Additional context

I see in #542 a discussion about the difficulties in testing the outpost feature. Perhaps this is a good reason to look into creation of the subnet outside of this vpc module.

[github-actions]

This issue has been automatically marked as stale because it has been open 30 days
with no activity. Remove stale label or comment or this issue will be closed in 10 days

[github-actions]

This issue was automatically closed because of stale in 10 days

[thebigcosinus]

Hi,

I need to have a separate route table for the Outpost.

Can we reopen this issue

Thanks

[bryantbiggs]

hi all, this should be addressed in the next version which is under development here https://github.com/clowdhaus/terraform-aws-vpc-v4/tree/main/modules/subnets

[github-actions]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues. If you have found a problem that seems similar to this, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.