feat: remove source tree on successful run

Signed-off-by: Lars Wirzenius <liw@liw.fi>

src/main.rs

@@ -156,6 +156,8 @@ fn run(
 
     run_log.write("CI run finished successfully\n".into())?;
 
+    std::fs::remove_dir_all(src).map_err(|e| NativeError::RemoveDir(src.into(), e))?;
+
     Ok(())
 }
 
@@ -335,4 +337,7 @@ enum NativeError {
 
     #[error("failed to write to log file {0}")]
     WriteLogFile(PathBuf, #[source] std::io::Error),
+
+    #[error("failed to remove {0}")]
+    RemoveDir(PathBuf, #[source] std::io::Error),
 }