Fix install command not downloading to cache if provided

Author: agg23

README.md

@@ -20,7 +20,7 @@ installer uninstall
 installer install --repos pinitd,mabl
 
 # Install from local download cache
-installer install --cache_dir cache
+installer install --cache-dir cache
 
 # Install using a GitHub PAT for downloads
 installer install --github-token [SOME_PAT]
@@ -29,7 +29,7 @@ installer install --github-token [SOME_PAT]
 installer install --remote-auth-url [SOME_SIGNING_URL]
 
 # Download to local cache
-installer download --cache_dir cache
+installer download --cache-dir cache
 
 # Dump current logs to file
 installer dump-logs

src/engine.rs

@@ -181,10 +181,7 @@ impl InstallationEngine {
             let repo_temp_dir = self.temp_dir.join(&repo.name);
 
             if !repo_temp_dir.exists() {
-                return Err(InstallerError::Config(format!(
-                    "No cached assets found for repository '{}'. Run 'penumbra download' first.",
-                    repo.name
-                )));
+                self.download_repository_assets(repo).await?;
             }
         } else {
             self.download_repository_assets(repo).await?;