Add support for ppc64le architecture

 Running bootc install commands on ppc64le system bails out
 with unsupported architecture error.

 ERROR Installing to disk: Creating rootfs: Unsupported architecture: powerpc64

 This patch enables support for ppc64le arch.

Signed-off-by: Sachin Sant <sachinp@linux.ibm.com>

lib/src/install/baseline.rs

@@ -256,6 +256,16 @@ pub(crate) fn install_create_rootfs(
             "BIOS-BOOT",
             Some("21686148-6449-6E6F-744E-656564454649"),
         );
+    } else if cfg!(target_arch = "powerpc64") {
+        // BIOS-BOOT
+        partno += 1;
+        sgdisk_partition(
+            &mut sgdisk.cmd,
+            partno,
+            "0:+4M",
+            "BIOS-BOOT",
+            Some("9E1A2D38-C612-4316-AA26-8B49521E5A8B"),
+        );
     } else if cfg!(target_arch = "aarch64") {
         // Only UEFI here for now
     } else {