fix: 'One of launch_configuration, launch_template, or mixed_instance must be set for an Auto Scaling Group'

[federicogatti]

Description

Executing terraform apply in the example-complete folder you will receive a message error likes

╷
│ Error: One of `launch_configuration`, `launch_template`, or `mixed_instances_policy` must be set for an Auto Scaling Group
│
│   with module.asg.aws_autoscaling_group.this[0],
│   on .terraform/modules/asg/main.tf line 309, in resource "aws_autoscaling_group" "this":
│  309: resource "aws_autoscaling_group" "this" {
│
╵

Motivation and Context

This commit will solve the message error.

Consulting Auto Scaling Module Reference I have used conditional creation for autoscaling group and launch configuration

Breaking Changes

There aren't breaking changes

How Has This Been Tested?

I have tested and validated these changes using executing terraform apply in complete-ecs examples folder.

Tested with Terraform v0.15.3

[antonbabenko]

Thank you!

v3.1.0 has been just released.

[github-actions]

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