proper backup config

infrastructure/backup/cronjobs-overlays/prune/kustomization.yaml

@@ -0,0 +1,22 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+namespace: backup
+resources:
+  - ../../cronjobs-base
+
+
+# patch the cronjob args field:
+patches:
+  - path: restic-commands.yaml
+    target:
+      kind: CronJob
+      name: restic-rclone-gdrive
+  - target:
+      kind: CronJob
+      name: restic-rclone-gdrive
+      # replace the name of the cronjob
+    patch: |-
+      - op: replace
+        path: /metadata/name
+        value: restic-gdrive-prune

infrastructure/backup/cronjobs-overlays/prune/restic-commands.yaml

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+apiVersion: batch/v1
+kind: CronJob
+metadata:
+  name: restic-gdrive-prune
+spec:
+  schedule: "0 0 1/15 * *"
+  # at midnight, the first and 15. of every month
+  
+  jobTemplate:
+    spec:
+      template:
+        spec:
+          initContainers:
+          - name: restic-base-container
+            args:
+            # >- strips newlines
+            # RESTIC_ARGS Can be for instance: --verbose --dry-run
+            # RESTIC_REPOSITORY is set in the secret
+              - >-
+                  restic forget
+                  -r $(RESTIC_REPOSITORY)
+                  --verbose=2
+                  --keep-daily 7 --keep-weekly 5
+                  --prune
+          containers:
+          - name: ntfy-command-send
+            env:
+              - name: OPERATION
+                value: "Restic prune on gdrive"