Get weekly release working

- fix missing permissions
- add doc

Author: stephanme

.github/workflows/release-cron.yml

@@ -7,6 +7,7 @@ on:
 
 permissions:
   contents: write
+  statuses: write
 
 jobs:
   check:

README.md

@@ -137,6 +137,14 @@ Dependabot PRs are merged automatically if they pass all required checks (tests
 
 ## Releases
 
+### Automatic Weekly Releases
+
+The workflow [Release Cron](https://github.com/cloudfoundry/storage-cli/actions/workflows/release-cron.yml) builds an automatic release every Monday morning if there are changes on the `main` branch (e.g. version bumps).
+
+The workflow builds and tests storage-cli, runs the integration tests and creates a **draft release** that needs to be published manually. Note that only published storage-cli releases are picked up by [capi-release](https://github.com/cloudfoundry/capi-release).
+
+If this process works well, the idea is to switch the workflow from draft to published releases.
+
 ### Manual Release
 Releases must be triggered manually by an approver. This can be done either via `GitHub Actions` (workflow dispatch) or through the `GitHub Releases` page using the **Draft a new release** option. The *Release Manual* workflow is responsible for creating and completing the release.