docs: create RELEASE.md file documenting release process

Signed-off-by: Adam Talbot <[email protected]>

Author: ThatsMrTalbot

README.md

@@ -17,20 +17,4 @@ Starting from v2, `cmctl` is versioned seperately from cert-manager itself.
 
 ## Release Process
 
-Create a Git tag with a tagname that has a `v` prefix and push it to GitHub.
-This will trigger the [release workflow].
-
-1. Create and push a Git tag
-
-```sh
-export VERSION=v2.0.0-alpha.0
-git tag --annotate --message="Release ${VERSION}" "${VERSION}"
-git push origin "${VERSION}"
-```
-
-2. Wait for the [release workflow] to succeed.
-
-3. Visit the [releases page], edit the draft release, click "Generate release notes", and publish the release.
-
-[release workflow]: https://github.com/cert-manager/cmctl/actions/workflows/release.yaml
-[releases page]: https://github.com/cert-manager/cmctl/releases
+The release process is documented in [RELEASE.md](RELEASE.md).

RELEASE.md

@@ -0,0 +1,38 @@
+# Releases
+
+## Schedule
+
+The release schedule for this project is ad-hoc. Given the pre-1.0 status of the project we do not have a fixed release cadence. However if a vulnerability is discovered we will respond in accordance with our [security policy](https://github.com/cert-manager/community/blob/main/SECURITY.md) and this response may include a release.
+
+## Process
+
+There is a semi-automated release process for this project. When you create a Git tag with a tagname that has a `v` prefix and push it to GitHub it will trigger the [release workflow].
+
+The release process for this repo is documented below:
+
+1. Create a tag for the new release:
+    ```sh
+   export VERSION=v0.5.0-alpha.0
+   git tag --annotate --message="Release ${VERSION}" "${VERSION}"
+   git push origin "${VERSION}"
+   ```
+2. A GitHub action will see the new tag and do the following:
+    - Build the binaries
+    - Create checksums for the binaries 
+    - Sign the checksums
+    - Create a draft GitHub release
+    - Upload binaries, checksums and signature to the GitHub release
+3. Visit the [releases page], edit the draft release, click "Generate release notes", then edit the notes to add the following to the top
+    ```
+    cmctl is the command line tool for interacting with cert-manager.
+    ```
+4. Publish the release.
+
+## Artifacts
+
+This repo will produce the following artifacts each release. For documentation on how those artifacts are produced see the "Process" section.
+
+- *Binaries* - The `cmctl` binary is created and attached to the GitHub release, along with its shasum
+
+[release workflow]: https://github.com/cert-manager/cmctl/actions/workflows/release.yaml
+[releases page]: https://github.com/cert-manager/cmctl/releases