Update release notes

RELEASE.md

@@ -1,13 +1,45 @@
 # Release Guide
 
-1. Ensure local `master` branch is up to date with `origin/master`.
-2. Ensure all checks are passing: `make check`.
-3. Update the [`changelog`](./CHANGELOG.md). Make sure that the format is consistent
-   especially the version heading. We follow [semantic versioning][semver] for our
-   releases.
-4. Commit the updated changelog with message: `Release <version>` .
-5. Create and push a new Git tag: note that we prefix our Git tags with `v` .
-6. [Draft](https://github.com/sapcc/absent-metrics-operator/releases/new) a new release
-   for the new tag. Use the release notes from the changelog as the release's description.
+We use [GoReleaser][goreleaser] and GitHub workflows for automating the release
+process. Follow the instructions below for creating a new release.
 
+1. Ensure local `master` branch is up to date with `origin/master`:
+
+   ```sh
+   git fetch --tags && git pull --tags
+   ```
+
+2. Ensure all checks are passing:
+
+   ```sh
+   make check
+   ```
+
+3. Update the [`CHANGELOG`](./CHANGELOG.md).
+   Make sure that the format is consistent especially the version heading.
+   We follow [semantic versioning][semver] for our releases.
+
+   You can check if the file format is correct by running [`release-info`][release-info] for the new version:
+
+   ```sh
+   go install github.com/sapcc/go-bits/tools/release-info@latest
+   release-info CHANGELOG.md X.Y.Z
+   ```
+
+   where `X.Y.Z` is the version that you are planning to release.
+
+4. Commit the updated changelog with message: `Release <version>`
+5. Create and push a new Git tag:
+
+   ```sh
+   git tag vX.Y.Z
+   git push --tags
+   ```
+
+   > [!IMPORTANT]
+   > Tags are prefixed with `v` and the GitHub release workflow is triggered for tags that match the `v[0-9]+.[0-9]+.[0-9]+` [gh-pattern].
+
+[release-info]: https://github.com/sapcc/go-bits/tree/master/tools/release-info
 [semver]: https://semver.org/spec/v2.0.0.html
+[gh-pattern]: https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#patterns-to-match-branches-and-tags
+[goreleaser]: https://github.com/goreleaser/goreleaser