install: Add bootloader option

For composefs backend we'd sometimes want to override the bootloader.
Currently we have logic that check if an image has bootupd or not, and
if it does we use grub as the bootloader, even if systemd-boot is
actually installed

We use this option to override the bootloader

Signed-off-by: Pragyan Poudyal <pragyanpoudyal41999@gmail.com>

Author: Johan-Liebert1

crates/kit/src/install_options.rs

@@ -40,6 +40,10 @@ pub struct InstallOptions {
     /// Default to composefs-native storage
     #[clap(long)]
     pub composefs_backend: bool,
+
+    /// Which bootloader to use for composefs-native backend
+    #[clap(long, requires = "composefs_backend")]
+    pub bootloader: Option<String>,
 }
 
 impl InstallOptions {
@@ -70,6 +74,11 @@ impl InstallOptions {
             args.push("--composefs-backend".to_owned());
         }
 
+        if let Some(b) = &self.bootloader {
+            args.push("--bootloader".into());
+            args.push(b.clone());
+        }
+
         args
     }
 }