add nginx docker example

[vangheem]

Description

does not need to be merged but a place to show nginx upstream auth with basic auth.

How was this PR tested?

Describe how you tested this PR.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (f418b65) 81.70% compared to head (dbc1cbd) 82.20%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1745      +/-   ##
==========================================
+ Coverage   81.70%   82.20%   +0.49%     
==========================================
  Files         336      336              
  Lines       19609    19609              
==========================================
+ Hits        16022    16119      +97     
+ Misses       3587     3490      -97     

Flag	Coverage Δ
ingest	69.05% <ø> (ø)
nucliadb	70.35% <ø> (+0.67%)	:arrow_up:
sdk	40.58% <ø> (ø)
train	63.71% <ø> (ø)
writer	85.15% <ø> (ø)

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