Add constructor

crates/systemd-credentials/src/lib.rs

@@ -66,6 +66,12 @@ pub trait ReadCredential {
 #[derive(Debug)]
 pub struct ReadCredDir<R: ReadEnv = EnvPath>(R);
 
+impl<R: ReadEnv> ReadCredDir<R> {
+    pub fn new(env_reader: R) -> Self {
+        Self(env_reader)
+    }
+}
+
  impl<R: ReadEnv> ReadCredential for ReadCredDir<R> {
     fn read_credential(&self, name: &str) -> Result<Option<String>> {
         let credentials_dir = self.0.read_env(CREDENTIALS_DIRECTORY);