Support configurable ingress class name for OSM ingress resources

Change-Id: If0cca9e796b5a85980bfb9c60a1e5c0755240b3e
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/installers/minio/00-base-config.rc b/installers/minio/00-base-config.rc
index e4cf1d6..0d59f1b 100644
--- a/installers/minio/00-base-config.rc
+++ b/installers/minio/00-base-config.rc
@@ -36,3 +36,6 @@
 # Expose with Ingress
 export MINIO_EXPOSE_CONSOLE=true
 export MINIO_EXPOSE_TENANT=true
+
+# Ingress classname
+export MINIO_INGRESS_CLASSNAME=${AUX_CLUSTER_INGRESS_CLASS:-nginx}