tech(build): moves builds script into main repo

scripts/build/sign_expect

@@ -0,0 +1,12 @@
+#!/usr/bin/expect -f
+# wrapper to make rpm --sign be non-interactive
+# passwd is 1st arg, file to sign is 2nd
+#send_user «$argv0 [lrange $argv 0 2]\n"
+#set files [lrange $argv 1 $argc ]
+
+set password [lindex $argv 0]
+set files [lindex $argv 1]
+spawn rpm --addsign $files
+expect "Enter pass phrase:"
+send -- "$password\r"
+expect eof