add missing RELEASE key

hifiscp/Chart.yaml

 apiVersion: v1
 name: hifiscp
-version: 0.1.17
+version: 0.1.18
 description: A Helm chart to deploy the HIFIS Cloud Portal Backend and Frontend
 keywords:
   - HIFIS

hifiscp/templates/db_backup_cronjob.yaml

@@ -66,5 +66,7 @@ spec:
                 secretKeyRef:
                   name: {{ template "hifiscp.fullname" . }}-s3-credentials
                   key: secret-access-key
+            - name: RELEASE
+              value: {{ .Release.Name }}
           restartPolicy: OnFailure
 {{ end }}
\ No newline at end of file