fix wrong key used in prepare.yaml workflow (#702)

Author: bartekpacia

.github/workflows/prepare.yaml

@@ -4,7 +4,7 @@ on:
   push:
     branches: [master]
     # don't run this workflow on version tags
-    ignore-tags: ["v*"]
+    tags-ignore: ["v*"]
   pull_request:
     branches: [master]
 
@@ -19,7 +19,6 @@ jobs:
         include:
           - channel: stable
           - channel: beta
-    
 
     steps:
       - name: Clone repository