ci: force disable use-keyboxd

Author: Wenzel

.github/builder/common.sh

@@ -2,6 +2,8 @@
 
 # NOTE: The `use-keyboxd` option in ~/.gnupg/common.conf should be disabled for this script's GPG routines to
 # work correctly!
+mkdir -p $HOME/.gnupg
+echo "use-keyboxd = no" > $HOME/.gnupg/common.conf
 
 set -e