added option to get signature as pandas dataframe

5 jobs for master in 78 minutes and 19 seconds (queued for 4 seconds)
Name Stage Failure
build_singularity_image_py37 Image The script exceeded the maximum execution time set for the job
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images: found 3 matching files and directories

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Created cache
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images/cc_py37.simg: found 1 matching files and directories

ERROR: Job failed: execution took longer than 1h0m0s seconds