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Reproducible Stack in 5 Steps

Step	Tech	One-liner Purpose
1	NixOS	Immutable host OS
2	Terraform	Provision K8s cluster
3	Docker	Local dev parity
4	Argo CD	GitOps continuous delivery
5	OPA Gatekeeper	Policy guardrails

Quickstart

nix develop – drops you into a shell with Terraform, kubectl, Argo CD CLI.
terraform init && terraform apply – spins up managed K8s.
kubectl apply -f argocd-app.yaml – bootstraps Argo CD.
kubectl apply -f constraint-template.yaml – sample “no latest tag” policy.