mjolnir/releasing.md

Releasing mjolnir

1. Create a new branch and edit the version variable of package.json to reflect the new version
2. Once that branch has been merged, switch back to the main branch and pull in the new changes
3. Tag the new version, ie git tag -s vX.Y.Z (where vX.Y.Z is the new version), and push the tag
4. Once the tag has been pushed, draft a new release on github: https://github.com/matrix-org/mjolnir/releases/new, using the Generate release notes button to automatically create the release notes/changelog
5. Double-check that everything is correct and make any changes as necessary, then publish the release
6. Publishing the release should kick off a Github Action to build and push the release to Dockerhub - verify that this did occur successfully