fix registry yaml

'A sequence was not expected'

Signed-off-by: Daniel Wagner <wagi@kernel.org>

Author: igaw

.github/workflows/registry.yml

@@ -25,18 +25,7 @@ jobs:
         uses: snok/container-retention-policy@3b0972b2276b171b212f8c4efbca59ebba26eceb # v3.0.1
         id: retention
         with:
-          image-names:
-            - alpine
-            - alpine.staging
-            - debian
-            - debian.staging
-            - fedora
-            - fedora.staging
-            - tumbleweed
-            - tumbleweed.staging
-            - ubuntu-cross-armhf
-            - ubuntu-cross-ppc64le
-            - ubuntu-cross-s390x
+          image-names: "alpine alpine.staging debian debian.staging fedora fedora.staging tumbleweed tumbleweed.staging ubuntu-cross-armhf ubuntu-cross-ppc64le ubuntu-cross-s390x"
           cut-off: 1w
           timestamp-to-use: updated_at
           image-tags: "!latest !next !main"