hmac key

[keegansmith21]

I have recently required the use of an HMAC key. I thought that I should create one and add it as an airflow connection, but discovered that you can just make one on the fly using your service account credentials. So I made this - which also deletes the key when the context manager closes.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (724bfd7) 86.64% compared to head (611cbb5) 86.64%.
Report is 1 commits behind head on develop.

❗ Current head 611cbb5 differs from pull request most recent head dd81415. Consider uploading reports for the commit dd81415 to get more accurate results

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #632   +/-   ##
========================================
  Coverage    86.64%   86.64%           
========================================
  Files           34       34           
  Lines         4626     4636   +10     
  Branches       559      559           
========================================
+ Hits          4008     4017    +9     
- Misses         500      505    +5     
+ Partials       118      114    -4     

Files Changed	Coverage Δ
observatory-platform/observatory/platform/gcs.py	69.53% <100.00%> (+0.33%)	⬆️

... and 1 file with indirect coverage changes

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[jdddog]

Thanks Keegan, it looks good.