make scrub inline and periodic

Signed-off-by: Andreea-Lupu <andreealupu1470@yahoo.com>

examples/config-allextensions.json

@@ -41,6 +41,9 @@
 			"cve": {
 				"updateInterval": "2h"
 			}
+		},
+		"scrub": {
+			"interval": "24h"
 		}
 	}
 }

examples/config-scrub.json

@@ -0,0 +1,18 @@
+{
+    "distSpecVersion":"1.0.1",
+    "storage": {
+        "rootDirectory": "/tmp/zot"
+    },
+    "http": {
+        "address": "127.0.0.1",
+        "port": "8080"
+    },
+    "log": {
+        "level": "debug"
+    },
+    "extensions": {
+        "scrub": {
+            "interval": "24h"
+        }
+    }
+}