[stable/mysql] Avoid creating initialization config-map if not needed

Signed-off-by: tompizmor <tompizmor@gmail.com>

bitnami/mysql/Chart.yaml

@@ -1,5 +1,5 @@
 name: mysql
-version: 4.0.5
+version: 4.0.6
 appVersion: 5.7.23
 description: Chart to create a Highly available MySQL cluster
 keywords:

bitnami/mysql/templates/initialization-configmap.yaml

@@ -1,3 +1,4 @@
+{{ if  (.Files.Glob "files/docker-entrypoint-initdb.d/*[sh|sql|sql.gz]") }}
 apiVersion: v1
 kind: ConfigMap
 metadata:
@@ -9,4 +10,5 @@ metadata:
     release: {{ .Release.Name | quote }}
     heritage: {{ .Release.Service | quote }}
 data:
-{{ (.Files.Glob "files/docker-entrypoint-initdb.d/*").AsConfig | indent 2 }}
+{{ (.Files.Glob "files/docker-entrypoint-initdb.d/*[sh|sql|sql.gz]").AsConfig | indent 2 }}
+{{ end }}