docs: crude release workflow doc (#284)

* docs: crude release workflow checklist

* docs: add changelog

The changelog format is based on [Keep a Changelog][kac] and can
be somewhat automated.

[kac]: https://keepachangelog.com/en/1.0.0/

docs/repo/README.md

@@ -5,6 +5,7 @@
 Documents on planning and process in the repository: what the labels mean, how issues are triaged, how a new release is cut and so on.
 
 - [Labels](./labels.md): Describes the labels in the repository.
+- [Release workflow](./release.md): Describes the release workflow for maintainers.
 
 ### Structure
 

docs/repo/release.md

@@ -0,0 +1,14 @@
+## Release Workflow
+
+1. Update the version in `Cargo.toml`
+2. Update the changelog[^1]
+    - Check that all issues marked https://github.com/foundry-rs/reth/labels/M-changelog have been added to the changelog
+    - Move the "Unreleased" section in the changelog under a new header with the new version, and fix up the links in the bottom of the file
+3. Ensure tests and lints pass
+4. Commit the new changelog and version bump
+5. Tag the new version (no `v` prefix)
+6. Push the new commit and tag
+7. (Run release command)[^2]
+
+[^1]: This can be automated somewhat.
+[^2]: TBD.