Add POSTGRES_INITDB_ARGS (#1127)

- Add POSTGRES_INITDB_ARGS environment variable to deployment
- Update README and values to reflect this addition

stable/postgresql/README.md

@@ -51,6 +51,7 @@ The following tables lists the configurable parameters of the PostgresSQL chart
 | `postgresUser`             | Username of new user to create.            | `postgres`                                                 |
 | `postgresPassword`         | Password for the new user.                 | random 10 characters                                       |
 | `postgresDatabase`         | Name for new database to create.           | `postgres`                                                 |
+| `postgresInitdbArgs`       | Initdb Arguments                           | `nil`                                                      |
 | `persistence.enabled`      | Use a PVC to persist data                  | `true`                                                     |
 | `persistence.existingClaim`| Provide an existing PersistentVolumeClaim  | `nil`                                                      |
 | `persistence.storageClass` | Storage class of backing PVC               | `nil` (uses alpha storage class annotation)                |

stable/postgresql/templates/deployment.yaml

@@ -25,6 +25,8 @@ spec:
           value: {{ default "postgres" .Values.postgresUser | quote }}
         - name: POSTGRES_DB
           value: {{ default "" .Values.postgresDatabase | quote }}
+        - name: POSTGRES_INITDB_ARGS
+          value: {{ default "" .Values.postgresInitdbArgs | quote }}
         - name: PGDATA
           value: /var/lib/postgresql/data/pgdata
         - name: POSTGRES_PASSWORD

stable/postgresql/values.yaml

@@ -21,6 +21,11 @@ imageTag: "9.6.2"
 ## Default: the postgres user
 # postgresDatabase:
 
+## Specify initdb arguments, e.g. --data-checksums
+## ref: https://github.com/docker-library/docs/blob/master/postgres/content.md#postgres_initdb_args
+## ref: https://www.postgresql.org/docs/current/static/app-initdb.html
+# postgresInitdbArgs:
+
 ## Persist data to a persitent volume
 persistence:
   enabled: true