@mashehu suggested that downloading the containers should not be opti…

…onal for Tower downloads. Given that there is the option to provide the list of remote containers to skip their download, I agree that this is reasonable.

nf_core/download.py

@@ -108,7 +108,7 @@ def __init__(
         self.force = force
         self.tower = tower
         self.include_configs = None
-        self.container = container if not singularity_cache_index else "singularity"
+        self.container = container if not singularity_cache_index or not tower else "singularity"
         self.singularity_cache = (
             singularity_cache if not singularity_cache_index else "remote"
         )  # if a singularity_cache_index is given, use the file and overrule choice.
@@ -377,7 +377,7 @@ def prompt_config_inclusion(self):
     def prompt_container_download(self):
         """Prompt whether to download container images or not"""
 
-        if self.container is None and stderr.is_interactive:
+        if self.container is None and stderr.is_interactive and not self.tower:
             stderr.print("\nIn addition to the pipeline code, this tool can download software containers.")
             self.container = questionary.select(
                 "Download software container images:",