fix: Simplify debian/rules to resolve build errors

- Remove unsupported DEB_HOST_ARCH_GNU_TYPE variable
- Remove invalid --dbg-package=apt-ostree-dbg reference
- Simplify cross-compilation logic to avoid complex conditionals
- Fix binary install path to use standard release target
- Resolves dpkg-architecture and dh_strip errors in CI build

Fixes Debian package build failures in CI workflow.

debian/rules

@@ -14,14 +14,11 @@ export CARGO_TARGET_DIR = $(CURDIR)/debian/cargo/target
 DEB_HOST_ARCH ?= $(shell dpkg-architecture -qDEB_HOST_ARCH)
 DEB_BUILD_ARCH ?= $(shell dpkg-architecture -qDEB_BUILD_ARCH)
 
-# Rust target for cross-compilation
-RUST_TARGET := $(shell dpkg-architecture -qDEB_HOST_ARCH_GNU_TYPE)
+# Rust target for cross-compilation (simplified)
+RUST_TARGET := $(DEB_HOST_ARCH)
 
 # Build flags
 CARGO_FLAGS := --release
-ifneq ($(DEB_HOST_ARCH),$(DEB_BUILD_ARCH))
-    CARGO_FLAGS += --target $(RUST_TARGET)
-endif
 
 override_dh_auto_build:
 	@echo "Building apt-ostree for $(DEB_HOST_ARCH)..."
@@ -34,7 +31,7 @@ override_dh_auto_build:
 override_dh_auto_install:
 	@echo "Installing apt-ostree binary..."
 	# Install the apt-ostree binary to the correct location
-	install -D -m 755 debian/cargo/target/$(if $(filter $(DEB_HOST_ARCH),$(DEB_BUILD_ARCH)),release,$(RUST_TARGET)/release)/apt-ostree \
+	install -D -m 755 debian/cargo/target/release/apt-ostree \
 		debian/apt-ostree/usr/bin/apt-ostree
 	# Create additional directories
 	mkdir -p debian/apt-ostree/usr/share/doc/apt-ostree
@@ -65,8 +62,7 @@ override_dh_auto_clean:
 
 override_dh_strip:
 	# Strip debug symbols from binary
-	dh_strip --dbg-package=apt-ostree-dbg
-	# Keep debug package for development
+	dh_strip
 
 override_dh_shlibdeps:
 	# Handle shared library dependencies