fix ci error

dnsapi/dns_burp.sh

@@ -23,7 +23,7 @@ dns_burp_add() {
   _saveaccountconf_mutable BURP_COLLABORATOR_RESTART "$BURP_COLLABORATOR_RESTART"
 
   json=$(cat $BURP_COLLABORATOR_CONFIG)
-  json=$(echo $json|jq ".customDnsRecords += [{\"label\": \"_acme-challenge\", \"record\": \"$txtvalue\", \"type\": \"TXT\", \"ttl\": 60}]")
+  json=$(echo "$json" | jq ".customDnsRecords += [{\"label\": \"_acme-challenge\", \"record\": \"$txtvalue\", \"type\": \"TXT\", \"ttl\": 60}]")
 
   echo "$json" >$BURP_COLLABORATOR_CONFIG
 
@@ -35,12 +35,11 @@ dns_burp_add() {
 #Usage: fulldomain txtvalue
 #Remove the txt record after validation.
 dns_burp_rm() {
-  fulldomain=$1
   txtvalue=$2
   _info "Using burp"
 
   json=$(cat $BURP_COLLABORATOR_CONFIG)
-  json=$(echo $json|jq "del(.customDnsRecords[] | select(.label == \"_acme-challenge\"))")
+  json=$(echo "$json" | jq "del(.customDnsRecords[] | select(.label == \"_acme-challenge\"))")
 
   echo "$json" >$BURP_COLLABORATOR_CONFIG