Fix ZSTD linking issue in Debian packaging

- Add libzstd-dev to Build-Depends in debian/control
- Add libzstd1 to runtime Depends
- Remove complex ZSTD verification from workflow
- Let Debian build system handle ZSTD dependencies properly
- Simplify workflow by removing unnecessary complexity

debian/control

@@ -2,7 +2,7 @@ Source: deb-bootupd
 Section: admin
 Priority: optional
 Maintainer: Debian Bootupd Team <debian-bootupd@lists.debian.org>
-Build-Depends: debhelper-compat (= 13), dh-cargo, rustc, cargo, pkg-config, libssl-dev, libsystemd-dev
+Build-Depends: debhelper-compat (= 13), dh-cargo, rustc, cargo, pkg-config, libssl-dev, libsystemd-dev, libzstd-dev
 Standards-Version: 4.6.2
 Homepage: https://git.raines.xyz/robojerk/deb-bootupd
 Vcs-Git: https://git.raines.xyz/robojerk/deb-bootupd.git
@@ -10,7 +10,7 @@ Vcs-Browser: https://git.raines.xyz/robojerk/deb-bootupd
 
 Package: deb-bootupd
 Architecture: any
-Depends: ${shlibs:Depends}, ${misc:Depends}, efibootmgr, grub-common
+Depends: ${shlibs:Depends}, ${misc:Depends}, efibootmgr, grub-common, libzstd1
 Recommends: ostree
 Description: Debian-compatible bootloader updater for immutable systems
  deb-bootupd is a sophisticated, production-ready Rust-based CLI tool that