bash and operator syntax fix

scripts/src/main.sh

@@ -47,6 +47,6 @@ echo "START PROCESS" "${coop}" "${instance}" "${repo}" "${now}"
 update_code "${coop}" "${instance}" "${repo}" "${now}" "${send_mails}" || exit 1
 echo "DONE"
 
-if [[ "${instance}" == "preprod" ]] -a ${send_mails}; then
+if [[ "${instance}" == "preprod" ]] && ${send_mails}; then
     python3 "${ci_dir}/send_mail.py" "${ci_data_dir}/ci_diff_third-party_${now}.txt" "${ci_data_dir}/ci_diff_Odoo_${now}.txt" "${coop}"
 fi