FEAT(ci): add ArgoCD Image Updater and CI/CD pipelines

- ArgoCD Image Updater for Zot registry polling
- Tekton Tasks: git-clone, buildah-build-push
- Pipelines: nextjs, fastapi, python
- ExternalSecrets for Zot and GitHub credentials

kustomization.yaml

@@ -7,5 +7,14 @@ resources:
   - cert-manager/argocd.yaml
   - traefik/argocd.yaml
 
+  # Tekton CI/CD Platform
+  - tekton/pipeline/argocd.yaml
+  - tekton/triggers/argocd.yaml
+  - tekton/dashboard/argocd.yaml
+  - tekton/ci-cd/argocd.yaml
+
+  # ArgoCD Image Updater
+  - argocd-image-updater/argocd.yaml
+
   # ArgoCD configuration (no Application, just configuration)
   - argocd