install: Mirror /run/udev into the install container

Without access to udev state, lsblk may fail during install-to-disk
operations.

See #688

Assisted-by: Claude Code (claude-opus-4-5-20251101)

Author: ckyrouac

crates/lib/src/install.rs

@@ -1598,6 +1598,9 @@ async fn prepare_install(
     // In some cases we may create large files, and it's better not to have those
     // in our overlayfs.
     bootc_mount::ensure_mirrored_host_mount("/var/tmp")?;
+    // udev state is required for running lsblk during install to-disk
+    // see https://github.com/bootc-dev/bootc/pull/688
+    bootc_mount::ensure_mirrored_host_mount("/run/udev")?;
     // We also always want /tmp to be a proper tmpfs on general principle.
     setup_tmp_mount()?;
     // Allocate a temporary directory we can use in various places to avoid