add logging app

apps/system/logging/.gitignore

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+requirements.lock
+charts/

apps/system/logging/Chart.yaml

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+name: logging

apps/system/logging/requirements.yaml

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+dependencies:
+- name: graylog
+  version: '1.3.9'
+  repository: '@stable'

main/apps/logging.yaml

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+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: logging
+  namespace: argocd
+  finalizers:
+  - resources-finalizer.argocd.argoproj.io
+spec:
+  destination:
+    namespace: logging
+    server: https://kubernetes.default.svc 
+  project: default
+  source:
+    path: apps/system/logging
+    repoURL: git@github.com:gorilych/gf-k8s
+  syncPolicy:
+    automated:
+      prune: true
+      selfHeal: true

main/namespaces/logging.yaml

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+apiVersion: v1
+kind: Namespace
+metadata:
+  name: logging