Separate executor docker image from plugin code

[EngHabu]

Signed-off-by: Haytham Abuelfutuh [email protected]

TL;DR

Please replace this text with a description of what this PR accomplishes.

Type

• [ ] Bug Fix
• [ ] Feature
• [ ] Plugin

Are all requirements met?

• [ ] Code completed
• [ ] Smoke tested
• [ ] Unit tests added
• [ ] Code documentation added
• [ ] Any pending items have an associated Issue

Complete description

How did you fix the bug, make the feature etc. Link to any design docs etc

Tracking Issue

https://github.com/lyft/flyte/issues/

Follow-up issue

NA OR https://github.com/lyft/flyte/issues/

[codecov[bot]]

Codecov Report

Merging #554 (b6c4f6b) into master (6875a5f) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #554   +/-   ##
=======================================
  Coverage   85.49%   85.49%           
=======================================
  Files         372      372           
  Lines       28976    28976           
  Branches     2318     2318           
=======================================
  Hits        24774    24774           
  Misses       3559     3559           
  Partials      643      643           

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