deb: allow adding multiple ppas for deps

src/main.rs

@@ -54,7 +54,8 @@ fn main() {
                 .about("Build the source package into binary package (.deb)")
                 .arg(arg!(-s --series <series> "Target distribution series").required(false))
                 .arg(arg!(-a --arch <arch> "Target architecture").required(false))
-                .arg(arg!(--ppa <ppa> "Build the package adding a specific PPA for dependencies").required(false))
+                .arg(arg!(--ppa <ppa> "Build the package adding a specific PPA for dependencies (can be specified multiple times)")
+                    .long_help("Build the package adding a specific PPA for dependencies. Can be specified multiple times.").required(false).action(clap::ArgAction::Append))
                 .arg(arg!(--inject <package> "Inject a package into the build environment (can be specified multiple times)")
                     .long_help("Inject a package into the build environment before build-dep. Can be a .deb file path, a package name from the archive, or a package from a previously added PPA. Can be specified multiple times.").required(false).action(clap::ArgAction::Append))
                 .arg(arg!(--cross "Cross-compile for target architecture (instead of qemu-binfmt)")
@@ -162,7 +163,15 @@ fn main() {
             let series = sub_matches.get_one::<String>("series").map(|s| s.as_str());
             let arch = sub_matches.get_one::<String>("arch").map(|s| s.as_str());
             let cross = sub_matches.get_one::<bool>("cross").unwrap_or(&false);
-            let ppa = sub_matches.get_one::<String>("ppa").map(|s| s.as_str());
+            let ppa: Vec<&str> = sub_matches
+                .get_many::<String>("ppa")
+                .map(|v| v.map(|s| s.as_str()).collect())
+                .unwrap_or_default();
+            let ppa = if ppa.is_empty() {
+                None
+            } else {
+                Some(ppa.as_slice())
+            };
             let inject_packages: Vec<&str> = sub_matches
                 .get_many::<String>("inject")
                 .map(|v| v.map(|s| s.as_str()).collect())