Add Plex GitOps application for automatic image updates

- Create organized directory structure (applications/, helm-values/)
- Add ArgoCD Application manifest for Plex with image auto-updater
- Configure automatic upgrade detection from current 1.41.8 to latest
- Enable Git write-back for GitOps workflow
- Use existing kube-plex chart with LinuxServer Plex image

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

applications/plex.yaml

@@ -0,0 +1,54 @@
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: plex
+  namespace: argocd
+  annotations:
+    # Enable automatic image updates for Plex
+    argocd-image-updater.argoproj.io/image-list: plex=linuxserver/plex
+    # Use newest-build strategy to detect newer versions than 1.41.8
+    argocd-image-updater.argoproj.io/plex.update-strategy: newest-build
+    # Write changes back to Git repository (GitOps workflow)
+    argocd-image-updater.argoproj.io/write-back-method: git
+    # Git configuration for write-back
+    argocd-image-updater.argoproj.io/git-branch: master
+    argocd-image-updater.argoproj.io/git-commit-user: argocd-image-updater
+    argocd-image-updater.argoproj.io/git-commit-email: argocd@turing.lan
+    argocd-image-updater.argoproj.io/git-commit-message: "chore: update Plex image to {{.NewTag}}"
+spec:
+  project: default
+  source:
+    # Use the kube-plex chart repository
+    repoURL: https://github.com/munnerz/kube-plex
+    path: charts/kube-plex
+    targetRevision: HEAD
+    helm:
+      releaseName: plex
+      # Override with values from our Gitea repository
+      parameters:
+        - name: image.repository
+          value: linuxserver/plex
+        - name: image.tag
+          value: "1.41.8"
+        - name: claimToken
+          value: "claim-Ku2YYmJzDB1mpyG6YD7x"
+        - name: timezone
+          value: "Europe/Amsterdam"
+        - name: service.type
+          value: "LoadBalancer"
+        - name: service.port
+          value: "32400"
+        - name: rbac.create
+          value: "true"
+        - name: kubePlex.enabled
+          value: "false"
+  destination:
+    server: https://kubernetes.default.svc
+    namespace: plex
+  syncPolicy:
+    automated:
+      prune: true
+      selfHeal: true
+    syncOptions:
+    - CreateNamespace=true
+    - ServerSideApply=true