fix typo in workflow

Signed-off-by: Jan Schoone <[email protected]>

Author: jschoone

.github/workflows/schedule-scan-image.yml

@@ -8,7 +8,7 @@ jobs:
   scan:
     name: Trivy
     runs-on: ubuntu-latest
-    container
+    container:
       image: ghcr.io/sovereigncloudstack/cso-builder:1.1.28
       credentials:
         username: ${{ github.actor }}