doc: release workflow documented in readme

Signed-off-by: Frédéric BIDON <fredbi@yahoo.com>

Author: fredbi

README.md

@@ -76,10 +76,14 @@ This library ships under the [SPDX-License-Identifier: Apache-2.0](./LICENSE).
 * [All-time contributors](./CONTRIBUTORS.md)
 * [Contributing guidelines](.github/CONTRIBUTING.md)
 
-## Cut a release
+## Cutting a new release
 
-Maintainers can cut a new release using
-[this workflow](https://github.com/go-openapi/gh-actions/actions/workflows/bump-release.yml).
+Maintainers can cut a new release by either:
+
+* running [this workflow](https://github.com/go-openapi/gh-actions/actions/workflows/bump-release.yml)
+* or pushing a semver tag
+  * signed tags are preferred
+  * The tag message is prepended to release notes
 
 <!-- Badges: status  -->
 [test-badge]: https://github.com/go-openapi/gh-actions/actions/workflows/test.yml/badge.svg