v0.11.0

Add self service portal @nitrocode (#35)

what

• Add self service portal
• Update tests to current standard for go 1.17
• Update workflows

why

• Allow users to customize the portal when connecting to the client vpn
• Routine maintenance

references

• Closes #34
• https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/ec2_client_vpn_endpoint

module "client_vpn" {
  source = "git::https://github.com/cloudposse/terraform-aws-ec2-client-vpn.git?ref=portal"

  # ...
}