Reana-commons

- Adds new utility to send emails.
- Adds centralised validation utility for workflow operational options.
- Adds new configuration variable to set the maximum number of running workflows. (`REANA_MAX_CONCURRENT_BATCH_WORKFLOWS`)
- Adds new configuration variable to set prefix of REANA cluster component names. (`REANA_COMPONENT_PREFIX`)
- Adds new configuration variable for the runtime pod node selector label. (`REANA_RUNTIME_KUBERNETES_NODE_LABEL`)
- Adds new configuration variable to define the Kubernetes namespace in which REANA infrastructure components run. (`REANA_INFRASTRUCTURE_KUBERNETES_NAMESPACE`)
- Adds new configuration variable to define the Kubernetes namespace in which REANA runtime components components run. (`REANA_RUNTIME_KUBERNETES_NAMESPACE`)
- Adds possibility to specify unpacked container images for running jobs.
- Adds support for `initfiles` operational option for the Yadage workflow engine.
- Fixes memory leak in Bravado client instantiation.
- Changes CephFS Persistent Volume Claim name. (`REANA_SHARED_PVC_NAME`)
- Changes default logging level to `INFO`.
- Changes default CVMFS volume list to include LHCb Gaudi related workflows.
- Changes code formatting to respect `black` coding style.
- Changes underlying requirements to use Kubernetes Python library version 11.
- Changes underlying requirements to use latest CVMFS CSI driver version.
- Changes documentation to single-page layout.

- Upgrades Kubernetes Python client.

- Adds new API for Gitlab integration.
- Adds new Kubernetes client API for ingresses.
- Adds new APIs for management of user secrets.
- Adds EOS storage Kubernetes configuration.
- Adds HTCondor and Slurm compute backends.
- Adds support for streaming file uploads.
- Allows unpacked CVMFS and CMS open data volumes.
- Adds Serial workflow step name and compute backend.
- Adds support for Python 3.8.

- Centralises log level and log format configuration.
- Adds new utility to inspect the disk usage on a given workspace.
(`get_workspace_disk_usage`)
- Introduces the module to share Celery tasks accross REANA
components. (`tasks.py`)
- Introduces common Celery task to determine whether REANA can
execute new workflows depending on a set of conditions
such as running job count. (`reana_ready`, `check_predefined_conditions`,
`check_running_job_count`)
- Allows the AMQP consumer to be configurable with multiple queues.
- Introduces new queue for workflow submission. (`workflow-submission`)
- Introduces new publisher for workflow submissions.
(`WorkflowSubmissionPublisher`)
- Centralises Kubernetes API client configuration and initialisation.
- Adds Kubernetes specific configuration for CVMFS volumes as utils.
- Introduces a new method, `copy_openapi_specs`, to automatically move
validated OpenAPI specifications from components to REANA Commons
`openapi_specifications` directory.
- Centralises interactive session types.
- Introduces central REANA errors through the `errors.py` module.
- Skips SSL verification for all HTTPS requests performed with the
`BaseAPIClient`.

- Aggregates OpenAPI specifications of REANA components.
- Improves AMQP re-connection handling. Switches from `pika` to `kombu`.
- Enhances test suite and increases code coverage.
- Changes license to MIT.

- Adds parameter expansion and validation utilities for parametrised Serial
workflows.