fix images names

Author: zeylos

.github/workflows/messages.yml

@@ -158,7 +158,7 @@ jobs:
       id-token: write
     secrets: inherit
     with:
-      image_name: "messages-frontend"
+      image_name: "frontend"
       context: "src/frontend"
       target: runtime-prod
 
@@ -171,6 +171,6 @@ jobs:
       id-token: write
     secrets: inherit
     with:
-      image_name: "messages-backend"
+      image_name: "backend"
       context: "src/backend"
       target: runtime-prod