chore: document release process

MAINTAINERS.md

@@ -0,0 +1,37 @@
+# Information Maintainers
+
+## Release Process
+
+Before performing a release, perform a local "smoke-test".
+If everything seems OK, you can proceed to do the following:
+
+1. Update the version string in the following places:
+   - `openapi.json`
+   - `chat/package.json`
+   - `lib/httpapi/server.go`
+2. Add details in `CHANGELOG.md` on what changed.
+3. Create a PR with the subject `chore: update version to X.Y.Z`
+4. Once the above PR is approved and merged, create a new git tag `vX.Y.Z` pointing to the commit of the above PR merged to `main`:S
+
+   ```shell
+     # Fetch existing tags first!
+     git fetch --tags
+     git tag -a vX.Y.Z -m 'vX.Y.Z'
+   ```
+
+5. Push the tag:
+
+   ```shell
+      git push origin tag vX.Y.Z
+   ```
+
+6. Visit `https://github.com/coder/agentapi/releases/tag/vX.Y.Z` and "Create release from tag".
+
+   - Select the tag you pushed previously.
+   - Select the previous tag and "Generate release notes". Amend as required.
+   - **IMPORTANT:** un-check "Set as latest release" and check "Set as a pre-release".
+   - Click "Publish Release". This will trigger a "Build Release Binaries" CI job.
+
+7. Visit `https://github.com/coder/agentapi/actions/workflows/release.yml` and monitor the status of the job that was created in the previous step. This will upload the built assets to the corresponding release.
+
+8. Once the updated assets are released, you can now visit `https://github.com/coder/agentapi/releases/tag/vX.Y.Z`, click "Edit" (✎), and check "Set as latest release".