Feature transformation server docker image

[felixwang9817]

What this PR does / why we need it: This PR builds a Docker image for the Python FTS.

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

NONE

[felixwang9817]

/kind feature

[codecov-commenter]

Codecov Report

Merging #1972 (fd19922) into master (3768766) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1972   +/-   ##
=======================================
  Coverage   82.07%   82.07%           
=======================================
  Files         100      100           
  Lines        7987     7991    +4     
=======================================
+ Hits         6555     6559    +4     
  Misses       1432     1432           

Flag	Coverage Δ
integrationtests	74.47% <100.00%> (+0.01%)	⬆️
unittests	59.30% <100.00%> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
sdk/python/feast/cli.py	38.70% <100.00%> (+0.19%)	⬆️
sdk/python/feast/constants.py	100.00% <100.00%> (ø)

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[adchia]

/lgtm

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: adchia, felixwang9817

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