fix: gzip all JSON OCRs when saving OCR file on disk

[raphael0202]

To save space, all OCR files were gzipped, but new generated files are still saved as plain text JSON files.
Also add a created_at field in the OCR JSON file containing the timestamp of generation of the OCR file. This is useful to know if we should generate again old OCR files.

[codecov-commenter]

Codecov Report

Merging #8320 (2bfb407) into main (a0cfac9) will increase coverage by 0.03%.
The diff coverage is 82.60%.

@@            Coverage Diff             @@
##             main    #8320      +/-   ##
==========================================
+ Coverage   48.46%   48.50%   +0.03%     
==========================================
  Files         114      114              
  Lines       21268    21295      +27     
  Branches     4768     4773       +5     
==========================================
+ Hits        10308    10329      +21     
- Misses       9677     9679       +2     
- Partials     1283     1287       +4     

Impacted Files	Coverage Δ
lib/ProductOpener/Import.pm	30.73% <0.00%> (-0.04%)	⬇️
lib/ProductOpener/Images.pm	10.37% <66.66%> (+0.22%)	⬆️
lib/ProductOpener/Packaging.pm	75.00% <75.00%> (ø)
lib/ProductOpener/Test.pm	40.75% <85.71%> (+3.19%)	⬆️
tests/unit/send_image_to_cloud_vision.t	100.00% <100.00%> (ø)

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[alexgarel]

@raphael0202 broken test: (tests/unit/send_image_to_cloud_vision.t)

To run locally : make unit-test test=send_image_to_cloud_vision.t

2023-04-14T08:49:53.5274088Z malformed JSON string, neither tag, array, object, number, string or atom, at character offset 0 (before "\x{1f}\x{fffd}\b\x{0}...") at tests/unit/send_image_to_cloud_vision.t line 50.
2023-04-14T08:49:53.5286080Z # Tests were run but no plan was declared and done_testing() was not seen.
2023-04-14T08:49:53.5292832Z # Looks like your test exited with 255 just after 3.
2023-04-14T08:50:02.4969181Z tests/unit/send_image_to_cloud_vision.t ....... 

[raphael0202]

@alexgarel I haven't set up Product Opener locally, will give it a try ;)

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
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[raphael0202]

@alexgarel it should be good now!

[raphael0202]

I checked locally, the generated gzipped JSON file saved correctly.

[alexgarel]

Great @raphael0202 !