Race condition in rollout

Making a release while the `Build and release` action is running can cause the rollout to end up using the wrong version.

The problem is:

1. We use `oddish` to get the right version for the npm package
2. We build the webapp using this version as part of the CDN_URL
3. We use `oddish` to get the right version and we publish the npm package.

If between 1 and 3, a version of the npm package is published (ie. because another action finished running), then the versions that oddish computes in step 1 and in step 3 are different. This causes the build to be uploaded to the CDN using a different url than the one it was used to build it. Then it's all 404s.

To fix this we should re-use the version we got in step 1 when we do step 3, instead of using `oddish` again. If there is a race condition, then what would happen is the step 3 is going to fail because a newer version already exists. Which is the right way to handle the race condition, instead of deploying something broken.