feat(build): Add auto-detection of PR number from GitHub Actions

When the --pr-number argument is not provided to the build upload command,
the PR number is now automatically detected from GitHub Actions environment
variables (GITHUB_EVENT_NAME and GITHUB_REF).

This enhancement works by:
- Checking if GITHUB_EVENT_NAME is "pull_request"
- Parsing GITHUB_REF format "refs/pull/{pr_number}/merge"
- Extracting the PR number and using it as the default value

Includes comprehensive tests to verify the detection logic works correctly
for various GitHub Actions scenarios.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: runningcode

src/commands/build/upload.rs

@@ -27,6 +27,31 @@ use crate::utils::vcs::{
     self, get_provider_from_remote, get_repo_from_remote, git_repo_head_ref, git_repo_remote_url,
 };
 
+fn get_default_pr_number() -> Option<u32> {
+    std::env::var("GITHUB_REF")
+        .ok()
+        .and_then(|github_ref| {
+            if let Ok(event_name) = std::env::var("GITHUB_EVENT_NAME") {
+                if event_name == "pull_request" && github_ref.starts_with("refs/pull/") {
+                    let pr_number_str = github_ref
+                        .strip_prefix("refs/pull/")?
+                        .split('/')
+                        .next()?;
+                    if let Ok(pr_number) = pr_number_str.parse::<u32>() {
+                        debug!("Auto-detected PR number from GitHub Actions: {}", pr_number);
+                        Some(pr_number)
+                    } else {
+                        None
+                    }
+                } else {
+                    None
+                }
+            } else {
+                None
+            }
+        })
+}
+
 pub fn make_command(command: Command) -> Command {
     #[cfg(all(target_os = "macos", target_arch = "aarch64"))]
     const HELP_TEXT: &str =
@@ -85,7 +110,7 @@ pub fn make_command(command: Command) -> Command {
             Arg::new("pr_number")
                 .long("pr-number")
                 .value_parser(clap::value_parser!(u32))
-                .help("The pull request number to use for the upload. If not provided, the current pull request number will be used.")
+                .help("The pull request number to use for the upload. If not provided, the PR number will be automatically detected from GitHub Actions environment variables.")
         )
         .arg(
             Arg::new("build_configuration")
@@ -173,7 +198,10 @@ pub fn execute(matches: &ArgMatches) -> Result<()> {
     let base_repo_name = matches.get_one("base_repo_name").map(String::as_str);
     let base_sha = matches.get_one("base_sha").map(String::as_str);
     let base_ref = matches.get_one("base_ref").map(String::as_str);
-    let pr_number = matches.get_one::<u32>("pr_number");
+    let pr_number = matches
+        .get_one::<u32>("pr_number")
+        .copied()
+        .or_else(|| get_default_pr_number());
 
     let build_configuration = matches.get_one("build_configuration").map(String::as_str);
     let release_notes = matches.get_one("release_notes").map(String::as_str);
@@ -238,7 +266,7 @@ pub fn execute(matches: &ArgMatches) -> Result<()> {
             base_repo_name,
             head_ref: head_ref.as_deref(),
             base_ref,
-            pr_number,
+            pr_number: pr_number.as_ref(),
         };
         match upload_file(
             &authenticated_api,
@@ -597,4 +625,25 @@ mod tests {
         );
         Ok(())
     }
+
+    #[test]
+    fn test_get_default_pr_number() {
+        std::env::set_var("GITHUB_EVENT_NAME", "pull_request");
+        std::env::set_var("GITHUB_REF", "refs/pull/123/merge");
+        
+        let pr_number = get_default_pr_number();
+        assert_eq!(pr_number, Some(123));
+        
+        std::env::set_var("GITHUB_EVENT_NAME", "push");
+        let pr_number = get_default_pr_number();
+        assert_eq!(pr_number, None);
+        
+        std::env::set_var("GITHUB_EVENT_NAME", "pull_request");
+        std::env::set_var("GITHUB_REF", "refs/heads/main");
+        let pr_number = get_default_pr_number();
+        assert_eq!(pr_number, None);
+        
+        std::env::remove_var("GITHUB_EVENT_NAME");
+        std::env::remove_var("GITHUB_REF");
+    }
 }