Get all configuration through Grafeas

[rcoy-v]

Changes

• Remove custom flag for Elasticsearch host; now from Grafeas config.
• Get Elasticsearch auth from config instead of hardcoded values.
• Use the same Dockerfile for local docker-compose as that which is published.

[codecov[bot]]

Codecov Report

Merging #26 (e543e6c) into main (f1fb05e) will increase coverage by 0.10%. The diff coverage is 94.11%.

@@            Coverage Diff             @@
##             main      #26      +/-   ##
==========================================
+ Coverage   89.20%   89.30%   +0.10%     
==========================================
  Files           3        4       +1     
  Lines         500      505       +5     
==========================================
+ Hits          446      451       +5     
  Misses         33       33              
  Partials       21       21              

Impacted Files	Coverage Δ
go/config/config.go	100.00% <ø> (ø)
go/v1beta1/storage/elasticsearch.go	86.59% <ø> (-0.47%)	:arrow_down:
go/v1beta1/storage/grafeas.go	94.11% <94.11%> (ø)

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