docs: document the container images (#317)

Closes #299

Signed-off-by: Gabriele Bartolini <[email protected]>
Co-authored-by: Marco Nenciarini <[email protected]>

Author: gbartolini

web/docs/images.md

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-sidebar_position: 40
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 # Container Images
 
 <!-- SPDX-License-Identifier: CC-BY-4.0 -->
 
-TODO
+The Barman Cloud Plugin is distributed using two container images:
+
+- One for deploying the plugin components
+- One for the sidecar that runs alongside each PostgreSQL instance in a
+  CloudNativePG `Cluster` using the plugin
+
+## Plugin Container Image
+
+The plugin image contains the logic required to operate the Barman Cloud Plugin
+within your Kubernetes environment with CloudNativePG. It is published on the
+GitHub Container Registry at `ghcr.io/cloudnative-pg/plugin-barman-cloud`.
+
+This image is built from the
+[`Dockerfile.plugin`](https://github.com/cloudnative-pg/plugin-barman-cloud/blob/main/containers/Dockerfile.plugin)
+in the plugin repository.
+
+## Sidecar Container Image
+
+The sidecar image is used within each PostgreSQL pod in the cluster. It
+includes the latest supported version of Barman Cloud and is responsible for
+performing WAL archiving and backups on behalf of CloudNativePG.
+
+It is available at `ghcr.io/cloudnative-pg/plugin-barman-cloud-sidecar` and is
+built from the
+[`Dockerfile.sidecar`](https://github.com/cloudnative-pg/plugin-barman-cloud/blob/main/containers/Dockerfile.sidecar).
+
+These sidecar images are designed to work seamlessly with the
+[`minimal` PostgreSQL container images](https://github.com/cloudnative-pg/postgres-containers?tab=readme-ov-file#minimal-images)
+maintained by the CloudNativePG Community.