fix(ci): fix yaml formatting in workflow heredocs

.github/actions/discord-notify/action.yml

@@ -14,23 +14,23 @@ inputs:
   color:
     description: Embed color (decimal)
     required: false
-    default: '3447003'
+    default: "3447003"
   username:
     description: Bot username
     required: false
-    default: 'OpenClaw CI'
+    default: "OpenClaw CI"
   avatar_url:
     description: Bot avatar URL
     required: false
-    default: 'https://avatars.githubusercontent.com/u/182880377'
+    default: "https://avatars.githubusercontent.com/u/182880377"
   timestamp:
     description: Include timestamp
     required: false
-    default: 'true'
+    default: "true"
   fields:
     description: JSON array of embed fields
     required: false
-    default: '[]'
+    default: "[]"
 
 runs:
   using: composite
@@ -42,10 +42,10 @@ runs:
         if [ "${{ inputs.timestamp }}" = "true" ]; then
           TIMESTAMP="\"timestamp\": \"$(date -u +%Y-%m-%dT%H:%M:%SZ)\","
         fi
-        
+
         # Escape description for JSON (use double quotes for variable expansion)
         DESCRIPTION=$(echo "${{ inputs.description }}" | jq -Rs .)
-        
+
         PAYLOAD=$(cat <<EOF
         {
           "username": "${{ inputs.username }}",
@@ -60,7 +60,7 @@ runs:
         }
         EOF
         )
-        
+
         curl -H "Content-Type: application/json" \
           -d "$PAYLOAD" \
           "${{ inputs.webhook_url }}"