update error_log for nextcloud

dockerfiles/services/nextcloud/cli/exec

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+set -e
+
+export DOCKER_HOST=${DOCKER_HOST:-'dkhost:2376'}
+
+container=$(docker ps -qn1)
+
+while getopts c: name
+do
+    case $name in
+      c)
+        container=$OPTARG
+        ;;
+      *)
+        ;;
+    esac
+done
+shift $((OPTIND -1))
+
+echo using container "${container}"
+# shellcheck disable=SC2068
+docker exec -it -u www-data "$container" $@