Add Procfile (for environments like Heroku)

Checklist

• I have read the Contribution & Best practices Guide.
• My branch is up-to-date with the upstream master branch.
• The tests pass locally with my changes.

Short description of what this resolves/which issues does this fix?:

• When running in an environment that expects a Procfile, operators must create one from scratch, despite the conditions being already defined.

Changes proposed in this pull request:

• Include a Procfile based on existing configuration