Add process for beta release

CONTRIBUTING.md

@@ -211,6 +211,15 @@ Checking:
 - Try the Docker image with tag 1.X.X (Clean install / amd64 / arm64 / armv7)
 - Try clean installation with Node.js
 
+### Release Beta Procedures
+
+1. Draft a release note, check "This is a pre-release"
+2. Make sure the repo is cleared
+3. `npm run release-beta` with env vars: `VERSION` and `GITHUB_TOKEN`
+4. `git push`
+5. Publish the release note as 1.X.X-beta.X
+6. Press any key to continue
+
 ### Release Wiki
 
 #### Setup Repo