add `mariadb.global.defaultStorageClass` to values.yaml #1061

Job	Run time
changes	6s
lint	31s
run-tests (Default - no custom values)	1m 45s
run-tests (PostgreSQL Enabled, --helm-extra-set-args "--set=postgresql.enabled=true --set=postgre...	2m 8s
run-tests (Nginx Enabled, --helm-extra-set-args "--set=image.flavor=fpm --set=nginx.enabled=true")	1m 42s
run-tests (Horizontal Pod Autoscaling Enabled, --helm-extra-set-args "--set=hpa.enabled=true --se...	1m 43s
summary	9s
	8m 4s

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