Check for potential PR channel

src/command_list.rs

@@ -22,8 +22,7 @@ pub fn run_command_list(paths: &GlobalPaths) -> Result<()> {
 
     let non_db_channels: Vec<String> = (get_channel_variations("nightly")?)
         .into_iter()
-        .map(|arch| format!("nightly~{}", arch))
-        .chain(std::iter::once("pr{number}".to_string()))
+        .chain(get_channel_variations("pr{number}")?)
         .collect();
     let non_db_rows: Vec<ChannelRow> = non_db_channels
         .into_iter()

src/operations.rs

@@ -20,6 +20,7 @@ use console::style;
 use flate2::read::GzDecoder;
 use indicatif::{ProgressBar, ProgressStyle};
 use indoc::formatdoc;
+use regex::Regex;
 use semver::Version;
 #[cfg(not(windows))]
 use std::os::unix::fs::PermissionsExt;
@@ -494,6 +495,10 @@ pub fn is_valid_channel(versions_db: &JuliaupVersionDB, channel: &String) -> Res
     Ok(regular || nightly)
 }
 
+pub fn is_pr_channel(channel: &String) -> bool {
+    return Regex::new(r"^(pr\d+)(~|$)").unwrap().is_match(channel);
+}
+
 // Identify the unversioned name of a nightly (e.g., `latest-macos-x86_64`) for a channel
 pub fn channel_to_name(channel: &String) -> Result<String> {
     let mut parts = channel.splitn(2, '~');