allow owner field in app.yaml

this makes it so app.yaml can process owner field in two ways,

In desdcending order of priority:
- via the `--owner` flag passed to the CLI
- via the `owner` field in the app.yaml

lib/cli/src/commands/app/mod.rs

@@ -117,7 +117,7 @@ pub async fn deploy_app_verbose(
     client: &WasmerClient,
     mut opts: DeployAppOpts<'_>,
 ) -> Result<(DeployApp, DeployAppVersion), anyhow::Error> {
-    let owner = &opts.owner;
+    let owner = &opts.owner.or_else(|| opts.app.owner.clone());
     let app = &opts.app;
 
     let pretty_name = if let Some(owner) = &owner {