fix(storage): do not open/download blobs when validating manifests (#1566)

when pushing manifests, zot will validate blobs (layers + config blob) are
present in repo, currently it opens(in case of filesystem storage) or download(
in case of cloud storage) each blob.

fixed that by adding a new method ImageStore.CheckBlobPresence() on storage
to check blobs presence without checking the cache like ImageStore.CheckBlob() method does.

Signed-off-by: Petu Eusebiu <peusebiu@cisco.com>

pkg/api/controller_test.go

@@ -3439,7 +3439,12 @@ func TestCrossRepoMount(t *testing.T) {
 		}
 
 		dir := t.TempDir()
-		ctlr := makeController(conf, dir, "../../test/data")
+		err := os.MkdirAll(path.Join(dir, "zot-cve-test"), storageConstants.DefaultDirPerms)
+		So(err, ShouldBeNil)
+
+		ctlr := makeController(conf, path.Join(dir, "zot-cve-test"), "../../test/data/zot-cve-test")
+
+		ctlr.Config.Storage.RootDirectory = dir
 		ctlr.Config.Storage.RemoteCache = false
 		ctlr.Config.Storage.Dedupe = false
 
@@ -3551,7 +3556,7 @@ func TestCrossRepoMount(t *testing.T) {
 		cm.StartAndWait(port)
 
 		// wait for dedupe task to run
-		time.Sleep(15 * time.Second)
+		time.Sleep(10 * time.Second)
 
 		params["mount"] = string(manifestDigest)
 		postResponse, err = client.R().