build, changelog: fix signing when building source package

src/changelog.rs

@@ -146,13 +146,13 @@ pub fn parse_changelog_footer(path: &Path) -> Result<(String, String), Box<dyn s
     // Find the last maintainer line (format: -- Name <email>  Date)
     let re = Regex::new(r"--\s*([^<]+?)\s*<([^>]+)>\s*")?;
 
-    if let Some(last_match) = re.captures_iter(&content).last() {
-        let name = last_match
+    if let Some(first_match) = re.captures_iter(&content).next() {
+        let name = first_match
             .get(1)
             .map_or("", |m| m.as_str())
             .trim()
             .to_string();
-        let email = last_match
+        let email = first_match
             .get(2)
             .map_or("", |m| m.as_str())
             .trim()