feat: build input features

pkg/ussdgw/DEBIAN/control

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+Package: ussdgw
+Version: 2501.22-YYYYMMDD
+Section: net
+Priority: optional
+Architecture: amd64
+Essential: no
+Depends:
+Conflicts: ussdgw
+Maintainer: 4GC
+Description: 4GC USSD Gateway Software

pkg/ussdgw/DEBIAN/postinst

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+#!/bin/bash
+
+test ! -f /usr/local/ussdgw/bin/conf/wxc2_sys.conf && cp -rf /usr/local/ussdgw/bin/conf/default/* /usr/local/ussdgw/bin/conf
+test ! -f /usr/local/ussdgw/bin/conf/yx_ussd.conf && cp -rf /usr/local/ussdgw/bin/conf/default/yx_ussd.conf /usr/local/ussdgw/bin/conf
+
+subDir="/usr/local/subsManage"
+if [ ! -d "$subDir" ]; then
+	mkdir $subDir
+	chmod 777 $subDir
+fi
+
+systemctl enable ussdgw
+
+exit 0

pkg/ussdgw/DEBIAN/prerm

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+#!/bin/bash
+
+# Commands to be run before uninstall of the package
+
+systemctl disable ussdgw
+