Change memlock limit in a Docker container; is it possible?

I'm running a container from vast.ai, Ubuntu 20.04 LTS.

I'd like to change memlock limit in the Docker container. Is it possible?

What I've already tried:

• Changing the memlock limits in /etc/security/limits.conf; tried:
  • * - memlock -1
  • * - memlock unlimited
  • root - memlock unlimited
• Adding DefaultLimitMEMLOCK=infinity to /etc/systemd/system.conf;
• Adding UseLogin yes to /etc/ssh/sshd_config;
• Using ulimit -l unlimited, "operation not permitted".