fix e2e test

Signed-off-by: rcmadhankumar <rcmadhankumar@gmail.com>

test/e2e/describe_test.go

@@ -873,8 +873,7 @@ origin: %s%s
 		)
 		fakeRegistryBuilder.WithBasicAuth(username, password)
 		_ = fakeRegistryBuilder.Build()
-		defer fakeRegistryBuilder.CleanUp()
-
+        defer fakeRegistryBuilder.CleanUp()
 		imgRef, err := regname.ParseReference(env.Image)
 		require.NoError(t, err)
 
@@ -919,6 +918,9 @@ images:
 			require.NoError(t, err)
 		})
 
+		// cleanup fake registry as it is not needed anymore
+		fakeRegistryBuilder.CleanUp()
+
 		logger.Section("executes describe command", func() {
 			stdout := imgpkg.Run(
 				[]string{"describe",