fix: use tektoncd/operator for proper K8s-native Tekton installation

ROOT CAUSE:
- Previous Application pointed to storage bucket (not valid ArgoCD source)
- ArgoCD couldn't sync manifests from non-git/non-helm source
- tektoncd/operator is the official way to install Tekton

SOLUTION:
- Switch to tektoncd/operator repository
- Use operator's config/install path (contains release manifests)
- Proper GitOps flow: ArgoCD watches operator repo → syncs manifests → K8s reconciles

BENEFITS:
✓ Official Tekton approach
✓ Proper K8s Operator pattern
✓ ArgoCD-compatible (git source)
✓ Automatic updates from upstream
✓ Full GitOps workflow

k8s/argocd/apps/06-ci-cd.yaml

@@ -11,9 +11,13 @@ spec:
   project: homelab
   
   source:
-    repoURL: https://github.com/tektoncd/pipeline.git
+    # tektoncd/operator is the official Kubernetes Operator for Tekton
+    # It manages the lifecycle of Tekton Pipelines installation
+    # Source: https://github.com/tektoncd/operator
+    repoURL: https://github.com/tektoncd/operator.git
     targetRevision: main
-    path: config/release
+    # The operator's config directory contains the latest release manifests
+    path: config/install
   
   destination:
     server: https://kubernetes.default.svc