Allow workflow on deployment_status filtering for state and environment

[smokedlinq]

We have workflows that need to run when the deployment_status state is success, failed, or error. We also want to run specific workflows only when a specific environment is successfully deployed. Today we accomplish this with an if condition on the job, but this still triggers the workflow and we see dozens of runs that do nothing creating a lot of noise in the workflow view.

Imagine something like this:

on:
  deployment_status:
    environments: [ 'MyEnv' ]
    states: [ 'success', 'failure' ]

[diastremskii]

This is something we'd really like as well, the envionment + status + branch filter.
Example use case: you are deploying to dev via third-party system (GHA only start the deployment, but can't follow wait for it to finish) and want to deploy to prod only if that succeeds. When using a workaround with if, list of checks per commit is going to have "skipped" when anything that doesn't match the condition is deployed, leaving a bad developer experience where one part of deployment is in one place, while the other part should be searched for manually on the "Actions" tab :/

[in-op]

This would be a very helpful feature. Running acceptance tests only on success for example. Otherwise you have to filter in the job if statements and have a bunch of empty workflow runs. Other events like push allow fine-grained control and in general that makes it more ergonomic for users.