Add docs to Azure v25.0.0 (#1324)

Author: yulianedyalkova

azure/v25.0.0/README.md

@@ -1 +1,16 @@
-# :zap: Giant Swarm Release v25.0.0 for CAPZ :zap:
+# :zap: Giant Swarm Release v25.0.0 for Azure :zap:
+
+We are happy to announce the first release for Azure that uses the new release framework.
+
+## Migration to new releases flow
+
+In order to consume the new flow, the following two fields need to be manually adapted:
+
+* In ConfigMap `<cluster name>-userconfig` set `.Values.global.release` to the release version, e.g. `25.0.0`.
+* In App `<cluster name>` remove the `spec.version` field. In case of GitOps, Flux might complain that the app manifest is invalid as the `spec.version` field is mandatory. In that case, edit the live App CR and set `spec.version` to an empty string. That will unblock Flux and allow it reconcile successfully.
+
+And if you want to use `kubectl-gs` to create a cluster, you'd need to now specify the release version, e.g.:
+
+```bash
+kubectl-gs template cluster --provider capz --organization my-org --name cluster_name --region westeurope --azure-subscription-id AZURE_ID --release 25.0.0
+```

azure/v25.0.0/announcement.md

@@ -0,0 +1,3 @@
+**Workload cluster release v25.0.0 for Azure is available**. We are happy to announce the first release for Azure that uses the new release framework.
+
+Further details can be found in the [release notes](https://docs.giantswarm.io/changes/workload-cluster-releases-azure/releases/azure-25.0.0/).