Restructure project layout for better CI/CD integration

- Flattened nested bootupd/bootupd/ structure to root level
- Moved all core project files to root directory
- Added proper Debian packaging structure (debian/ directory)
- Created build scripts and CI configuration
- Improved project organization for CI/CD tools
- All Rust source, tests, and configuration now at root level
- Added GitHub Actions workflow for automated testing
- Maintained all original functionality while improving structure

debian/rules

@@ -0,0 +1,15 @@
+#!/usr/bin/make -f
+
+%:
+	dh $@
+
+override_dh_auto_build:
+	dh_cargo build --release
+
+override_dh_auto_install:
+	dh_cargo install --target-dir=target/release
+	# Install systemd service files
+	install -D -m 644 systemd/bootupd.service debian/deb-bootupd/etc/systemd/system/
+	install -D -m 644 systemd/bootupd.socket debian/deb-bootupd/etc/systemd/system/
+	# Create symlinks for multicall binary
+	ln -sf /usr/bin/bootupd debian/deb-bootupd/usr/bin/bootupctl