K8SPG-615: Add initialDelaySeconds for backups (#522)

Author: egegunes

Diff for: charts/pg-db/README.md

@@ -167,6 +167,7 @@ The chart can be customized using the following configurable parameters:
 | `backups.pgbackrest.repoHost.securityContext`             | The Kubernetes Pod security context for pgBackRest repo                                                                                                                                                             | `{}`                                                          |
 | `backups.pgbackrest.manual.repoName`                      | Name of the pgBackRest repository for on-demand backups                                                                                                                                                             | `repo1`                                                       |
 | `backups.pgbackrest.manual.options`                       | The on-demand backup command-line options which will be passed to pgBackRest for on-demand backups                                                                                                                  | `--type=full`                                                 |
+| `backups.pgbackrest.manual.initialDelaySeconds`                       | Number of seconds to wait before starting the backup. After the backup pod is scheduled, its entrypoint will wait for this number of seconds before initiating the backup process. | `0`                                                 |
 | `backups.pgbackrest.repos.repo1.name`                     | Name of the pgBackRest repository for backups                                                                                                                                                                       | `repo1`                                                       |
 | `backups.pgbackrest.repos.repo1.schedules.full`           | Scheduled time to make a full backup specified in the crontab format                                                                                                                                                | `0 0 \* \* 6`                                                 |
 | `backups.pgbackrest.repos.repo1.schedules.differential`   | Scheduled time to make a differential backup specified in the crontab format                                                                                                                                        | `0 0 \* \* 6`                                                 |

Diff for: charts/pg-db/templates/cluster.yaml

@@ -444,6 +444,9 @@ spec:
         {{- range .Values.backups.pgbackrest.manual.options }}
         - {{ . }}
         {{- end }}
+{{ if hasKey .Values.backups.pgbackrest.manual "initialDelaySeconds" }}
+        initialDelaySeconds: {{ .Values.backups.pgbackrest.manual.initialDelaySeconds }}
+{{- end}}
       repos:
       {{- range $repo := .Values.backups.pgbackrest.repos }}
       - name: {{ $repo.name }}

Diff for: charts/pg-db/values.yaml

@@ -447,6 +447,7 @@ backups:
       repoName: repo1
       options:
       - --type=full
+#      initialDelaySeconds: 120
     repos:
     - name: repo1
       schedules: