Add endpoint to start workflow execution from arbitrary git repository

Only available if the environment variable DEV_SYSTEM is set to True.

POST /workflow_executions/arbitrary
Permission workflow:create

1. Client send workflow version id and config to WFS
2. Input
   • Repository URL
   • Git Commit Hash
   • Parameters
   • Report Output Bucket (Optional)
3. WFS asks AS if user is allowed to start workflow
   • Check active workflow limit
   • Check if necessary files are in the repository
4. Check config with json schema of workflow and user has access to referenced buckets
5. Save workflow execution to database with unique ID
6. Copy config into separate s3 bucket
7. Start nextflow via Slurm REST API (python library through openapi-generator)
   • Tower Tracing enabled -> point to WLS
   • workflow execution ID as workspace ID (somehow inject workflow execution id)
   • Save Slurm job Id to database to enable canceling the job
8. Return Workflow execution instance with status pending