Add a copy/ install wrapper (use in steps function)

aptpkg

@@ -27,6 +27,14 @@ error_usage_die(){
 	exit 1
 }
 
+# Copy/ install wrapper for files
+cin-bin(){
+	install -Dm755 "$@"
+}
+cin-file(){
+	install -Dm644 "$@"
+}
+
 # Check that "build" file exists in directory
 check(){
 	if ! [ -f "$1/build" ]; then
@@ -67,7 +75,7 @@ build_file(){
 	gen_control_file "$@"
 
 	for maintfile in preinst postinst prerm postrm; do
-		[ -f $maintfile ] && cp $maintfile "$builddir"/debian/
+		[ -f $maintfile ] && cin-bin $maintfile "$builddir"/debian/
 	done
 
 	cd -