REANA-Workflow-Controller 0.8.0

• Adds users quota accounting.
• Adds new job properties started_at and finished_at to the /logs endpoint.
• Adds configuration environment variable to limit the number of messages received in the job status consumer (prefetch_count).
• Adds file search capabilities to the workflow workspace endpoint.
• Adds Snakemake workflow engine support.
• Adds support for custom workflow workspace path.
• Changes to PostgreSQL 12.8
• Changes workflow run manager to query the specific workflow engine during pod deletion.
• Fixes workflow list endpoint query logic to improve optimization.