add noop provider

Signed-off-by: Mathieu Tortuyaux <mtortuyaux@microsoft.com>

src/providers/noop/mod.rs

@@ -0,0 +1,28 @@
+// Copyright 2023 CoreOS, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+use anyhow::Result;
+
+use crate::providers::MetadataProvider;
+
+/// Noop provider
+pub struct NoopProvider {}
+
+impl NoopProvider {
+    pub fn try_new() -> Result<NoopProvider> {
+        Ok(Self { })
+    }
+}
+
+impl MetadataProvider for NoopProvider {}