chore: Run all service for development with bin/dev

It takes time to start all services for local verification. Running
everything with `bin/dev` increases productivity.

Author: arkirchner

Procfile

@@ -0,0 +1,4 @@
+assets: bin/shakapacker-dev-server
+executor: ../poseidon/poseidon
+worker: bin/jobs
+web: bin/rails s -p 7000

bin/dev

@@ -1,2 +1,2 @@
 #!/usr/bin/env ruby
-exec "./bin/rails", "server", *ARGV
+exec "overmind", "start", *ARGV

docs/LOCAL_SETUP.md

@@ -239,6 +239,11 @@ For exporting metrics, enable the Prometheus exporter in `config/code_ocean.yml`
 bundle exec prometheus_exporter
 ```
 
+#### Overmind (optional)
+
+A Procfile is configured to run all services with the `bin/dev` command. [Overmind](https://github.com/DarthSim/overmind) is required as a process manager and the Poseidon must be in placed in the parent directory (../poseidon/poseidon). 
+
+
 ## Native Setup for Nomad
 
 As detailed earlier, this guide focuses on CodeOcean. Nevertheless, the following provides a short overview of the most important steps to get started with Nomad (as required for Poseidon). Please refer to the [full setup guide](https://github.com/openHPI/poseidon/blob/main/docs/development.md) for more details.