Alternatives

Docker Swarm - an alternative to Kubernetes.

Docker Swarm vs Kubernetes

Jenkins - CI/CD 

If being locked into a specific ecosystem is not appealing to you Jenkins is fairly interoperable with many git providers.

https://www.jenkins.io/doc/book/pipeline/

Github Actions

Github Actions == GitLab Runner is another ecosystem specific platform, but since github is now owned by Microsoft I am less inclined to use it.

https://github.com/features/actions

Additional Resources

Running a self hosted Gitlab server

https://gitlab.com/rluna-gitlab/gitlab-ce

Docker Alternatives

I had to evaluate wether it made sense to use Docker, Podman, or LXC in this RLO and found the differences between the 3 interesting. I ended up going with Docker because of the community support and low barrier to entry.

https://overcast.blog/docker-lightweight-alternatives-podman-or-lxc-09dc216a04e6