fix: write out policy data in a secret config correctly

In wasmCloud#307 we introduced secrets support, which works by storing secrets
references as config in NATS KV. This fixes a bug in the way that we
were serializing the configuration as JSON where we were overwriting the
policy field which is required.

crates/wadm/src/scaler/secretscaler.rs

@@ -107,7 +107,7 @@ impl<S: SecretSource + Send + Sync + Clone> Scaler for SecretScaler<S> {
             (Ok(_config), scaler_config) => {
                 debug!(self.secret_name, "Putting secret");
 
-                let cfg = merge_policy_config(&self.policy, &scaler_config)?;
+                let cfg = merge_policy_properties(&self.policy, &scaler_config)?;
 
                 *self.status.write().await = StatusInfo::reconciling("Secret out of sync");
                 Ok(vec![Command::PutConfig(PutConfig {
@@ -131,21 +131,21 @@ impl<S: SecretSource + Send + Sync + Clone> Scaler for SecretScaler<S> {
     }
 }
 
-fn merge_policy_config(
+fn merge_policy_properties(
     policy: &Policy,
     reference: &SecretSourceProperty,
 ) -> anyhow::Result<HashMap<String, String>> {
     let mut cfg: HashMap<String, String> = reference.clone().try_into()?;
     let mut p = policy.properties.clone();
     p.insert("type".to_string(), policy.policy_type.clone());
     let policy_json = serde_json::to_string(&p)?;
-    cfg.insert("policy".to_string(), policy_json);
+    cfg.insert("policy_properties".to_string(), policy_json);
     Ok(cfg)
 }
 
 #[cfg(test)]
 mod test {
-    use super::merge_policy_config;
+    use super::merge_policy_properties;
 
     use crate::{
         commands::{Command, PutConfig},
@@ -192,7 +192,7 @@ mod test {
             StatusType::Reconciling
         );
 
-        let cfg = merge_policy_config(&policy, &secret.source).expect("failed to merge policy");
+        let cfg = merge_policy_properties(&policy, &secret.source).expect("failed to merge policy");
 
         assert_eq!(
             secret_scaler