docs: example deployment

example-deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: backup-sidecar
+spec:
+  selector:
+    matchLabels:
+      app: backup-sidecar
+  template:
+    metadata:
+      labels:
+        app: backup-sidecar
+    spec:
+      containers:
+        - name: backup-sidecar
+          image: gitea.t000-n.de/t.behrendt/backupsidecar:latest
+          volumeMounts:
+            - mountPath: /mnt/toBackup
+              name: data
+              readOnly: true
+            - mountPath: /mnt/backups/gitea
+              name: nfs-backup
+              subPath: gitea
+          env:
+            - name: INTERVAL
+              value: "15 14 * * *"
+            - name: RESTIC_REPOSITORY
+              value: /mnt/backups/gitea
+            - name: SOURCEDIR
+              value: "/mnt/toBackup/"
+            - name: KEEPLAST
+              value: "100"
+            - name: RESTIC_PASSWORD
+              valueFrom:
+                secretKeyRef:
+                  name: restic-credentials
+                  key: password
+            - name: RUNONSTART
+              value: "false"
+            - name: GOTIFYHOST
+              value: "https://<gotify-URL>"
+            - name: GOTIFYTOKEN
+              valueFrom:
+                secretKeyRef:
+                  name: gotify-credentials
+                  key: token
+            - name: GOTIFYTOPIC
+              value: "gitea"
+      volumes:
+        - name: data
+          persistentVolumeClaim:
+            claimName: data
+        - name: nfs-backup
+          persistentVolumeClaim:
+            claimName: backup-nfs