Fix CI/CD bug with PGSSLROOTCERT.

Because I pushed the environment variable changes to the cluster
already, psycopg2 was automatically trying to connect to the database
using the file specified in PGSSLROOTCERT. That ConfigMap was not
mounted into the migrations container, so I'm doing that here.

script/cluster_migration

@@ -28,7 +28,7 @@ if echo "$JOB_SUCCESS" | grep -q "condition met"; then
 else
   POD_NAME=$(${K8S_CMD} -n atat get pods -l job-name=migration -o=jsonpath='{.items[0].metadata.name}')
   echo "Job failed:"
-  $K8S_CMD -n atat log $POD_NAME
+  $K8S_CMD -n atat logs $POD_NAME
   delete_job
   exit 1
 fi