concurrency setting for beta deployment

[donsizemore]

Payara 6 autodeploys asynchronously on service launch, and recent versions seem to allow multiple copies to launch simultaneously on beta.dataverse.org, causing service outages.

It looks like we can set a concurrency of 1 for this (and other?) actions: https://docs.github.com/en/actions/writing-workflows/choosing-what-your-workflow-does/control-the-concurrency-of-workflows-and-jobs

Pull request forthcoming.