Add self service portal

[nitrocode]

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 https://github.com/cloudposse/terraform-aws-ec2-client-vpn/issues/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"

  # ...
}

[nitrocode]

/test all

[Nuru]

/test all

[Nuru]

/test all

[Nuru]

/test all

[Nuru]

/test all

[Nuru]

/test terratest previous test failed with a timeout