Clean up with trap

cleanup-with-trap.sh

#!/bin/bash

set -e # will stop the script if any command fails with a non-zero exit code

function cleanup {
    ./teardown.sh || true # keep tearing down, even if file does not exist
    echo "🧹 Cleaned up."
}
trap cleanup EXIT

./do-whatever.sh

# Even if do-whatever.sh fails, trap will run the cleanup function.
# In case of error, the script will return a non-zero exit code, as usual.