Add prune command

[giuseppe-steduto]

closes #651

[codecov-commenter]

Codecov Report

Merging #652 (7f006bc) into master (13eba1b) will decrease coverage by 0.41%. The diff coverage is 28.12%.

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Additional details and impacted files

[](https://codecov.io/gh/reanahub/reana-client/pull/652?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=reanahub) ```diff @@ Coverage Diff @@ ## master #652 +/- ## ========================================== - Coverage 57.71% 57.31% -0.41% ========================================== Files 24 24 Lines 2327 2359 +32 ========================================== + Hits 1343 1352 +9 - Misses 984 1007 +23 ``` | [Impacted Files](https://codecov.io/gh/reanahub/reana-client/pull/652?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=reanahub) | Coverage Δ | | |---|---|---| | [reana\_client/api/client.py](https://codecov.io/gh/reanahub/reana-client/pull/652?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=reanahub#diff-cmVhbmFfY2xpZW50L2FwaS9jbGllbnQucHk=) | `43.58% <9.09%> (-0.95%)` | :arrow_down: | | [reana\_client/cli/files.py](https://codecov.io/gh/reanahub/reana-client/pull/652?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=reanahub#diff-cmVhbmFfY2xpZW50L2NsaS9maWxlcy5weQ==) | `73.28% <38.09%> (-2.59%)` | :arrow_down: |