release process: ensure we always release Docker Compose and keep upgrade docs up-to-date (!1223) · Merge requests · Warren Gifford / about

Created by: slimsag

Adds instructions for releasing Docker Compose.
Ensures we always release Docker Compose on time, and on every patch release.
Ensures we always keep upgrade docs up-to-date: https://docs.sourcegraph.com/admin/updates/kubernetes and https://docs.sourcegraph.com/admin/updates/docker_compose

@daxmc99 please account for these changes in the 3.18 release you are currently doing

release process: ensure we always release Docker Compose and keep upgrade docs up-to-date