Merge branch 'last-snapshot-time' into 'master'

Skip taking a new snapshot if there is no new data:
Check the last snapshot time in the create snapshot script and compare with the current `data_state_at` 

See merge request !106
5 jobs for master in 4 minutes and 14 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
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lint

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test

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  Build Binary
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build-binary-alpine

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  Build Image
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build-image-master-client

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build-image-master-server

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