Update docker.yml

syntax fix...

Author: julesghub

.github/workflows/docker.yml

@@ -35,7 +35,7 @@ concurrency:
 
 jobs:
   build-test-publish-images:
-    runs-on: ubuntu-latest, arm-droid
+    runs-on: [ubuntu-latest, arm-droid]
     permissions:
       contents: write