Add quotes

Author: dennisameling

.github/workflows/cleanup-self-hosted-runners.yml

@@ -50,7 +50,7 @@ jobs:
               vm_name=$(echo $active_vm | jq '.name')
               # Use jq to extract and format the date-time string
               vm_creation_time_string=$(echo $active_vm | jq -r '.timeCreated | sub("\\.[0-9]+[+-][0-9]+:[0-9]+$"; "") | sub("T"; " ")')
-              vm_creation_time=$(TZ=UTC date -d $vm_creation_time_string +%s)
+              vm_creation_time=$(TZ=UTC date -d "$vm_creation_time_string" +%s)
 
               if [ "$one_hour_ago" -lt "$vm_creation_time" ]; then
                   echo "::notice::The VM ${vm_name} was created less then 1 hour ago and shouldn't be deleted yet. Skipping."