add Debian packaging and repository infrastructure

debian/postinst

@@ -0,0 +1,27 @@
+#!/bin/sh
+set -e
+
+# Create necessary directories
+mkdir -p /var/lib/deb-mock/chroots
+mkdir -p /var/cache/deb-mock
+mkdir -p /etc/schroot/chroot.d
+
+# Set proper permissions
+chown root:root /var/lib/deb-mock/chroots
+chmod 755 /var/lib/deb-mock/chroots
+chown root:root /var/cache/deb-mock
+chmod 755 /var/cache/deb-mock
+
+# Create deb-mock group if it doesn't exist
+if ! getent group deb-mock >/dev/null 2>&1; then
+    addgroup --system deb-mock
+fi
+
+# Add users to deb-mock group if they exist
+if getent passwd build >/dev/null 2>&1; then
+    usermod -a -G deb-mock build || true
+fi
+
+echo "deb-mock package installed successfully."
+echo "Users in the 'deb-mock' group can use deb-mock without sudo."
+echo "To add a user to the deb-mock group: sudo usermod -a -G deb-mock <username>"