Bring exact version check logic from IndexFile.Get into registry tag check

Signed-off-by: Scott Rigby <scott@r6by.com>

internal/experimental/registry/util.go

@@ -54,6 +54,14 @@ func GetTagMatchingVersionOrConstraint(tags []string, versionString string) (str
 		// If string is empty, set wildcard constraint
 		constraint, _ = semver.NewConstraint("*")
 	} else {
+		// when customer input exact version, check whether have exact match
+		// one first
+		for _, v := range tags {
+			if versionString == v {
+				return v, nil
+			}
+		}
+
 		// Otherwise set constraint to the string given
 		var err error
 		constraint, err = semver.NewConstraint(versionString)