Update github action.

.github/workflows/cd.yml

@@ -1,6 +1,9 @@
 name: Create docker images
 
-on: [create]
+on:
+  push:
+    branches:
+      - master
 
 jobs:
 
@@ -27,4 +30,4 @@ jobs:
         buildArgs: DATABASE_TYPE=${{ matrix.db-type }}
         registry: ghcr.io/${{ github.actor }}
         username: ${{ github.actor }}
-        password: ${{ secrets.GITHUB_TOKEN }}
+        password: ${{ secrets.GITHUB_TOKEN }}