feat(sync): use regclient for sync extension (#2903)

* feat(sync): use regclient for sync extension

replaced containers/image package with regclient/regclient package

Signed-off-by: Eusebiu Petu <petu.eusebiu@gmail.com>

* fix(sync): fixed converting innner docker list mediatype

Signed-off-by: Eusebiu Petu <petu.eusebiu@gmail.com>

* feat(sync): added option to preserve digest

Signed-off-by: Eusebiu Petu <petu.eusebiu@gmail.com>

* fix(sync): added coverage and various fixes

Signed-off-by: Eusebiu Petu <petu.eusebiu@gmail.com>

* fix(metadb): fixed converting manifest list not setting platform and annotations

Signed-off-by: Eusebiu Petu <petu.eusebiu@gmail.com>

* fix(sync): remove read lock on storage, not used concurrently

Signed-off-by: Eusebiu Petu <petu.eusebiu@gmail.com>

* feat(sync): added cache for repo tags

Signed-off-by: Eusebiu Petu <petu.eusebiu@gmail.com>

* fix(sync): fixed Makefile
removed opengpg tag

Signed-off-by: Eusebiu Petu <petu.eusebiu@gmail.com>

* fix(sync): add test for on demand referrer

Signed-off-by: Eusebiu Petu <petu.eusebiu@gmail.com>

---------

Signed-off-by: Eusebiu Petu <petu.eusebiu@gmail.com>

examples/config-sync.json

@@ -73,10 +73,25 @@
 					],
 					"onDemand": true,
 					"tlsVerify": true,
-					"maxRetries": 6,
-					"retryDelay": "5m"
+					"maxRetries": 5,
+					"retryDelay": "30s"
+				},
+				{
+					"urls": [
+						"https://demo.goharbor.io"
+					],
+					"pollInterval": "12h",
+					"content": [
+						{
+							"prefix": "zot/**"
+						}
+					],
+					"onDemand": true,
+					"tlsVerify": true,
+					"maxRetries": 5,
+					"retryDelay": "1m"
 				}
 			]
 		}
 	}
-}
+}