dpl-workflow: Use /var/tmp as cache folder for GPU RTC cache

Author: davidrohr

prodtests/full-system-test/dpl-workflow.sh

@@ -320,7 +320,7 @@ if has_detector_calib PHS && workflow_has_parameter CALIB; then
 fi
 
 [[ ${O2_GPU_DOUBLE_PIPELINE:-$EPNSYNCMODE} == 1 ]] && GPU_CONFIG+=" --enableDoublePipeline"
-[[ ${O2_GPU_RTC:-0} == 1 ]] && GPU_CONFIG_KEY+="GPU_proc_rtc.enable=1;GPU_proc_rtc.cacheOutput=1;GPU_proc.RTCcacheFolder=/tmp/o2_gpu_rtc_cache;"
+[[ ${O2_GPU_RTC:-0} == 1 ]] && GPU_CONFIG_KEY+="GPU_proc_rtc.enable=1;GPU_proc_rtc.cacheOutput=1;GPU_proc.RTCcacheFolder=/var/tmp/o2_gpu_rtc_cache;"
 
 ( workflow_has_parameter AOD || [[ -z "$DISABLE_ROOT_OUTPUT" ]] || needs_root_output o2-emcal-cell-writer-workflow ) && has_detector EMC && RAW_EMC_SUBSPEC=" --subspecification 1 "
 has_detector_reco MID && has_detector_matching MCHMID && MFTMCHConf="FwdMatching.useMIDMatch=true;" || MFTMCHConf="FwdMatching.useMIDMatch=false;"