feat: support resolve: prefixed ami for launch-time resolution#4
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adds an optional ami variable accepting an explicit ami-* id or a resolve:ssm:* reference. when set, the value is passed through to the launch template so ec2 resolves the ami at instance launch time rather than at apply time. defaults to the apply-time ssm lookup when empty.
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Summary
Adds an optional
amivariable so users can pin instances to aresolve:ssm:*reference (or an explicitami-*ID).When a
resolve:ssm:*value is supplied, it is passed straight through to the launch template'simage_id. EC2 then resolves the SSM parameter to the latest AMI at instance launch time rather than atterraform applytime. This means ASG scale-ups / instance refreshes pick up the newest AMI without re-running Terraform.Behavior
amivalue""(default)resolve:ssm:/pathami-0123...Changes
variables.tf: newamivariable (default"") with validation restricting to empty,ami-*, orresolve:*main.tf:local.image_idselectsvar.amiwhen set, else the existing SSM lookup; moduleimage_idnow useslocal.image_idNotes
Backwards compatible — default behavior is unchanged.
terraform fmtpasses locally; relying on CI forterraform validate(local provider download was unreliable).