feat: Implement comprehensive Debian packaging improvements and enhanced CI workflow

- Enhanced Package Information: Expanded PackageInfo struct with 23 fields including section, priority, maintainer, homepage, size, dependencies, and more
- Real Package Data Extraction: Integrated dpkg and apt-cache for actual package information instead of mock data
- Professional Debian Packaging: Added man pages, shell completions, postinst/prerm scripts, triggers, and lintian overrides
- Enhanced Build System: Improved debian/rules with cross-compilation support, enhanced build.sh with options and validation
- CI Workflow Updates: Added missing build dependencies, enhanced package validation, lintian quality checks, and comprehensive reporting
- Quality Assurance: Added lintian validation, enhanced file checking, and professional packaging standards
- Documentation: Comprehensive README.Debian with build instructions and troubleshooting guide

Resolves mock package issues and provides production-ready Debian packaging infrastructure.

debian/apt-ostree.postinst

@@ -0,0 +1,137 @@
+#!/bin/sh
+# postinst script for apt-ostree
+#
+# This script is executed after the package is unpacked and configured.
+# It handles post-installation tasks such as creating directories,
+# setting up configuration files, and updating system caches.
+
+set -e
+
+# Source debconf library
+. /usr/share/debconf/confmodule
+
+# Package name
+PACKAGE="apt-ostree"
+
+# Configuration directories
+CONFIG_DIR="/etc/apt-ostree"
+DATA_DIR="/var/lib/apt-ostree"
+LOG_DIR="/var/log/apt-ostree"
+
+# OSTree system directory
+OSTREE_DIR="/ostree"
+
+case "$1" in
+    configure)
+        echo "Configuring $PACKAGE..."
+        
+        # Create necessary directories
+        mkdir -p "$CONFIG_DIR"
+        mkdir -p "$DATA_DIR"
+        mkdir -p "$LOG_DIR"
+        
+        # Set proper permissions
+        chmod 755 "$CONFIG_DIR"
+        chmod 755 "$DATA_DIR"
+        chmod 755 "$LOG_DIR"
+        
+        # Create default configuration file if it doesn't exist
+        if [ ! -f "$CONFIG_DIR/config.toml" ]; then
+            cat > "$CONFIG_DIR/config.toml" << 'EOF'
+# apt-ostree configuration file
+# Generated automatically during package installation
+
+[general]
+# Log level: trace, debug, info, warn, error
+log_level = "info"
+
+# Data directory for apt-ostree
+data_dir = "/var/lib/apt-ostree"
+
+# OSTree system directory
+ostree_dir = "/ostree"
+
+[apt]
+# APT configuration overrides
+# These settings will be used instead of system defaults if specified
+
+[ostree]
+# OSTree configuration overrides
+# These settings will be used instead of system defaults if specified
+
+[security]
+# Security settings
+# Enable package signature verification
+verify_signatures = true
+
+# Enable sandboxing for package operations
+enable_sandbox = true
+EOF
+            chmod 644 "$CONFIG_DIR/config.toml"
+            echo "Created default configuration file: $CONFIG_DIR/config.toml"
+        fi
+        
+        # Create log rotation configuration
+        if [ ! -f "/etc/logrotate.d/apt-ostree" ]; then
+            cat > "/etc/logrotate.d/apt-ostree" << 'EOF'
+/var/log/apt-ostree/*.log {
+    daily
+    missingok
+    rotate 7
+    compress
+    delaycompress
+    notifempty
+    create 644 root root
+    postrotate
+        # Reload any services if needed
+        systemctl reload apt-ostree > /dev/null 2>&1 || true
+    endscript
+}
+EOF
+            chmod 644 "/etc/logrotate.d/apt-ostree"
+            echo "Created log rotation configuration"
+        fi
+        
+        # Check if OSTree is available and configured
+        if command -v ostree >/dev/null 2>&1; then
+            echo "OSTree is available on the system"
+            
+            # Check if OSTree repository exists
+            if [ -d "$OSTREE_DIR" ]; then
+                echo "OSTree repository directory exists: $OSTREE_DIR"
+            else
+                echo "Note: OSTree repository directory does not exist: $OSTREE_DIR"
+                echo "You may need to initialize OSTree before using apt-ostree"
+            fi
+        else
+            echo "Warning: OSTree is not available on the system"
+            echo "apt-ostree requires OSTree to function properly"
+            echo "Please install the 'ostree' package"
+        fi
+        
+        # Update shell completion caches
+        if command -v update-bash-completion >/dev/null 2>&1; then
+            update-bash-completion apt-ostree || true
+        fi
+        
+        # Update man page database
+        if command -v mandb >/dev/null 2>&1; then
+            mandb -q || true
+        fi
+        
+        echo "$PACKAGE configuration completed successfully"
+        ;;
+        
+    abort-upgrade|abort-remove|abort-deconfigure)
+        # Handle upgrade/removal failures
+        echo "Aborting $PACKAGE configuration..."
+        ;;
+        
+    *)
+        echo "postinst called with unknown argument \`$1'" >&2
+        exit 1
+        ;;
+esac
+
+# Exit successfully
+exit 0