docs: version 0.4.0

Signed-off-by: Marco Nenciarini <[email protected]>

Author: mnencia

web/versioned_docs/version-0.4.0/features.md

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+---
+sidebar_position: 2
+---
+
+# Features
+
+This plugin enables continuous backup to object storage for a PostgreSQL
+cluster using the [barman-cloud](https://pgbarman.org/) tool suite.
+
+The features provided by this plugin are:
+
+- Data Directory Backup
+- Data Directory Restore
+- WAL Archiving
+- WAL Restoring
+- Point-in-Time Recovery (PITR)
+- Replica Clusters
+
+This plugin is compatible with all object storage services supported by
+barman-cloud, including:
+
+- Amazon AWS S3
+- Google Cloud Storage
+- Microsoft Azure Blob Storage
+
+The following storage solutions have been tested and confirmed to work with
+this implementation:
+
+- [MinIO](https://min.io/) – An S3-compatible object storage solution.
+- [Azurite](https://github.com/Azure/Azurite) – A simulator for Microsoft Azure Blob Storage.
+- [fake-gcs-server](https://github.com/fsouza/fake-gcs-server) – A simulator for Google Cloud Storage.
+
+Backups created with in-tree object store support can be restored using this
+plugin, ensuring compatibility and reliability across environments.
+

web/versioned_docs/version-0.4.0/installation.md

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+sidebar_position: 4
+---
+
+# Installation
+
+**IMPORTANT NOTES:**
+
+1. The plugin **must** be installed in the same namespace where the operator is
+   installed (typically `cnpg-system`).
+
+2. Be aware that the operator's **listening namespaces** may differ from its
+   installation namespace. Ensure you verify this distinction to avoid
+   configuration issues.
+
+Here’s an enhanced version of your instructions for verifying the prerequisites:
+
+## Step 1 - Verify the Prerequisites
+
+If CloudNativePG is installed in the default `cnpg-system` namespace, verify its version using the following command:
+
+```sh
+kubectl get deployment -n cnpg-system cnpg-controller-manager -o yaml \
+  | grep ghcr.io/cloudnative-pg/cloudnative-pg
+```
+
+Example output:
+
+```output
+image: ghcr.io/cloudnative-pg/cloudnative-pg:1.26.0
+```
+
+Ensure that the version displayed is **1.26** or newer.
+
+Then, use the [cmctl](https://cert-manager.io/docs/reference/cmctl/#installation)
+tool to confirm that `cert-manager` is correctly installed:
+
+```sh
+cmctl check api
+```
+
+Example output:
+
+```output
+The cert-manager API is ready
+```
+
+Both checks are necessary to proceed with the installation.
+
+## Step 2 - Install the barman-cloud Plugin
+
+Use `kubectl` to apply the manifest for the latest commit in the `main` branch:
+
+<!-- x-release-please-start-version -->
+```sh
+kubectl apply -f \
+  https://github.com/cloudnative-pg/plugin-barman-cloud/releases/download/v0.3.0/manifest.yaml
+```
+<!-- x-release-please-end -->
+
+Example output:
+
+```output
+customresourcedefinition.apiextensions.k8s.io/objectstores.barmancloud.cnpg.io created
+serviceaccount/plugin-barman-cloud created
+role.rbac.authorization.k8s.io/leader-election-role created
+clusterrole.rbac.authorization.k8s.io/metrics-auth-role created
+clusterrole.rbac.authorization.k8s.io/metrics-reader created
+clusterrole.rbac.authorization.k8s.io/objectstore-editor-role created
+clusterrole.rbac.authorization.k8s.io/objectstore-viewer-role created
+clusterrole.rbac.authorization.k8s.io/plugin-barman-cloud created
+rolebinding.rbac.authorization.k8s.io/leader-election-rolebinding created
+clusterrolebinding.rbac.authorization.k8s.io/metrics-auth-rolebinding created
+clusterrolebinding.rbac.authorization.k8s.io/plugin-barman-cloud-binding created
+secret/plugin-barman-cloud-8tfddg42gf created
+service/barman-cloud created
+deployment.apps/barman-cloud configured
+certificate.cert-manager.io/barman-cloud-client created
+certificate.cert-manager.io/barman-cloud-server created
+issuer.cert-manager.io/selfsigned-issuer created
+```
+
+After these steps, the plugin will be successfully installed. Make sure it is
+ready to use by checking the deployment status as follows:
+
+```sh
+kubectl rollout status deployment \
+  -n cnpg-system barman-cloud
+```
+
+Example output:
+
+```output
+deployment "barman-cloud" successfully rolled out
+```
+
+This confirms that the plugin is deployed and operational.