Added dockcheck under CI/CD section.

Tooting my own horn here:
dockcheck - A script checking updates for docker images without pulling - then selectively auto-update some/all containers (with extras like notifications, pruning and more).

README.md

@@ -596,6 +596,7 @@ Services to securely store your Docker images.
 -   [Cyclone](https://github.com/caicloud/cyclone) - Powerful workflow engine and end-to-end pipeline solutions implemented with native Kubernetes resources by [@caicloud](https://github.com/caicloud).
 -   [Depot :heavy_dollar_sign:](https://depot.dev) - Build Docker images fast, in the cloud. Blazing fast compute, automatic intelligent caching, and zero configuration. [Done in seconds](https://depot.dev/#benchmarks).
 -   [Diun](https://github.com/crazy-max/diun) - Receive notifications when an image or repository is updated on a Docker registry by [@crazy-max].
+-   [dockcheck](https://github.com/mag37/dockcheck) - A script checking updates for docker images without pulling then auto-update selected/all containers. With notifications, pruning and more.
 -   [Docker plugin for Jenkins](https://github.com/jenkinsci/docker-plugin/) - The aim of the docker plugin is to be able to use a docker host to dynamically provision a slave, run a single build, then tear-down that slave.
 -   [Drone](https://github.com/drone/drone) - Continuous integration server built on Docker and configured using YAML files.
 -   [GitLab Runner](https://gitlab.com/gitlab-org/gitlab-runner) - GitLab has integrated CI to test, build and deploy your code with the use of GitLab runners.