((

action.yml

@@ -13,7 +13,7 @@ inputs:
     description: "list of tags"
     required: true
 outputs:
-  differs:
+  exist:
     description: "Returns either true or false"
     value: ${{ steps.check.outputs.differs }}
 

check.sh

@@ -2,7 +2,7 @@
 
 set -e
 
-TAGS=$((skopeo list-tags $1 || echo '{"Tags":[]}' )| jq '["alatest","latest"] - .Tags')
+TAGS=$( (skopeo list-tags $1 || echo '{"Tags":[]}' )| jq '["alatest","latest"] - .Tags')
 echo $TAGS | jq '"Tag not found: "+ .[]'
 RESULT=$($TAGS | jq '.==[]')
 if $RESULT == "true"