Remove update-docker-build-image from README

Author: sarahchen6

.github/workflows/README.md

@@ -91,16 +91,6 @@ Close them if no following update within a week.
 
 _Recovery:_ Manually trigger the action again.
 
-### update-docker-build-image [🔗](update-docker-build-image.yaml)
-
-_Trigger:_ Quarterly released, loosely [a day after the new image tag is created](https://github.com/DataDog/dd-trace-java-docker-build/blob/master/.github/workflows/docker-tag.yml).
-
-_Action:_ Update the Docker build image used in GitLab CI with the latest tag.
-
-_Recovery:_ Download artifacts and upload them manually to the related _download release_.
-
-_Notes:_  Manually trigger the action again given the desired image tag as input.
-
 ### update-download-releases [🔗](update-download-releases.yaml)
 
 _Trigger:_ When a release is published.