test: variant files

Author: Hofer-Julian

.env.ci

@@ -0,0 +1,5 @@
+   # Test with specific PR from pixi repository
+   PIXI_PR_NUMBER="4665"
+
+   # Test with specific PR from pixi-build-backends repository
+   BUILD_BACKENDS_PR_NUMBER="400"

scripts/download-artifacts.py

@@ -285,6 +285,7 @@ def download_github_artifact(
     # Get the target_artifact
     target_artifact = None
     pr = None
+    selected_run = None
 
     if run_id:
         # Use specific run ID - no need to find workflow first
@@ -344,6 +345,9 @@ def download_github_artifact(
             if target_artifact:
                 break
 
+    if selected_run is None:
+        raise ValueError("Could not find a suitable workflow run")
+
     console.print(f"[blue]Selected run: {selected_run.id} from {selected_run.created_at}")
 
     if not target_artifact: