buildkite hooks: Run cleanup script once

Timeout causes SIGINT signal -> cleanup function runs -> cleanup function calls exit() -> EXIT signal -> cleanup function runs

Noticed in https://buildkite.com/materialize/nightly/builds/13959#019a471f-8649-4463-a473-68bbab4f5d32

Author: def-

ci/plugins/cloudtest/hooks/command

@@ -185,6 +185,8 @@ cleanup() {
   sudo systemctl restart docker
   docker ps --all --quiet | xargs --no-run-if-empty docker rm --force --volumes
 
+  # Don't run the cleanup function twice
+  trap - EXIT SIGTERM SIGINT
   exit "$CI_ANNOTATE_ERRORS_RESULT"
 }
 

ci/plugins/mzcompose/hooks/command

@@ -350,6 +350,8 @@ cleanup() {
       exit 1
   fi
 
+  # Don't run the cleanup function twice
+  trap - EXIT SIGTERM SIGINT
   exit "$CI_ANNOTATE_ERRORS_RESULT"
 }