Feature/s3 support

[etlstrauss]

Description

This PR implements the possibility to dynamically mount S3 storage via a sidecar and s3fs via /dev/fuse volume by setting the corresponding user variables mentioned in #671 into the interactive session of a workflow. The implementation should allow to disable this functionality via the helm charts / values.yaml file.

Related Work

Fixes / Implements

• Implements Adding S3 mount over sidecar and env variables/secrets #671 (partly / only interactive sessions)

other issues

• Also implements variable passing for REANA_RUNTIME_JOBS_KUBERNETES_TOLERATIONS or similar patch for scheduling on Interlink worker node reana-job-controller#504

Dependencies

• Depends on PR Feature/s3 controlling via values.yaml file reana#933 cause the helm charts have to be changed to allow controlling this feature via values.yaml file.

Type of Change

• New feature (non-breaking change which adds functionality)

Checklist:

• Testing was done by using run-tests.sh
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• Tests where done by manually applying changes
• New test was added for automatic testing
• Implementation is completed / ready to be merge into the master branch

[etlstrauss]

Addition:
This PR will also be preparing the mounting of s3-storages in the workflow jobs running on k8 backend. This will be done in connection to the repository https://github.com/reanahub/reana-job-controller. See following PR (comming).