build: first implementation

wrap around dpkg-buildpackage

src/main.rs

@@ -49,6 +49,7 @@ fn main() {
                 .arg(arg!(--backport "This changelog is for a backport entry").required(false))
                 .arg(arg!(-v --version <version> "Target version").required(false)),
         )
+        .subcommand(Command::new("build").about("Build the source package"))
         .get_matches();
 
     match matches.subcommand() {
@@ -101,6 +102,13 @@ fn main() {
                 .args(["debian/changelog"])
                 .status();
         }
+        Some(("build", _sub_matches)) => {
+            let cwd = std::env::current_dir().unwrap();
+            if let Err(e) = pkh::build::build_source_package(Some(&cwd)) {
+                error!("{}", e);
+                std::process::exit(1);
+            }
+        }
         _ => unreachable!("Exhausted list of subcommands and subcommand_required prevents `None`"),
     }
 }