workflow: fix matrix error

Author: lightislost

.github/workflows/docker-image-pull.yml

@@ -11,9 +11,9 @@ jobs:
         architecture: [amd64, arm64]
         os: [linux]
         service:
-          -name: runtime:0.1.0
-          -name: ekgservice:0.1.0
-          -name: ekgfrontend:0.1.0
+          - name: runtime:0.1.0
+          - name: ekgservice:0.1.0
+          - name: ekgfrontend:0.1.0
 
     steps:
       - name: Checkout code