Merge remote-tracking branch 'origin/release/14.6' into dev

docs/installation-and-operations/installation/docker/README.md

@@ -29,7 +29,27 @@ The OpenProject **BIM Edition** is only supported on AMD64, however.
 Note that the docker container setup does not allow for integration of repositories within OpenProject. You can reference external repositories, but cannot set them up through OpenProject itself.
 For that feature to work, you need to use the packaged installation method.
 
-## Overview
+## Available containers
+
+OpenProject provides two container flavors with a number of target tags:
+
+- **slim**:  Contains just the application image and application server used for starting behind a proxy, or within the [OpenProject for Docker compose](../docker-compose/) or [OpenProject Helm chart](../helm-chart/) installation methods. We recommend using this image for production systems.
+- **all-in-one**: Starts internal PostgreSQL, memcached servers alongside the application in order to provide a quick-start for testing or getting started with OpenProject. The lower part of this documentation focused on this installation method.
+
+OpenProject follows semantic versioning, and tags are pushed on [Docker Hub openproject/openproject](https://hub.docker.com/r/openproject/openproject/tags) in the following way:
+
+- `X.Y.Z`, `X.Y.Z-slim` : **non-floating** tags to provide exactly one release of OpenProject, and you have to update these tags when a new release is made
+-  `X.Y`,  `X-Y.slim` **floating** tags that get pushed whenever a new patch release is made. Please keep in mind that in case of urgent fixes, database migrations might still occur in patch releases, so you need to be able to run the seeder/migrations job. Refer to the installation method of your choice for information on how to do that.
+- `X`,  `X-Y.slim` **floating** tags that get pushed whenever a new patch or minor release is made. If you use these tags, you are aware that application changes will occur.
+- `dev`, `dev-slim` **floating** tag that gets pushed nightly with the latest development version. These tags are automatically deployed to our QA instances, and are useful for testing and _early_ feedback. We try to keep these versions usable, but we strongly recommend against using them for anything with production data.
+
+
+
+We recommend to use non-floating tags for production systems, and use the built-in version check, or our release notes (subscribe to them through GitHub, or release newsletters) to be informed of updates.
+
+
+
+## Installation overview
 
 OpenProject's docker setup can be launched in two ways: