add a global datacube init

[mathleur]

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 89.65517% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 88.62%. Comparing base (e7fb3b2) to head (69250db).

❗ Current head 69250db differs from pull request most recent head 5670e4b. Consider uploading reports for the commit 5670e4b to get more accurate results

Files	Patch %	Lines
polytope/datacube/backends/fdb.py	0.00%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #111      +/-   ##
===========================================
+ Coverage    87.15%   88.62%   +1.47%     
===========================================
  Files           96       83      -13     
  Lines         7183     7119      -64     
===========================================
+ Hits          6260     6309      +49     
+ Misses         923      810     -113     

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