[Feature] Update docker script and circleci to automatically upload core image

[yun-yeo]

Summary of changes

• remove unused part in Makefile
• change the name of docker image on the docker script
• change circleci to upload image to hub

Report of required housekeeping

• Github issue OR spec proposal link
• Wrote tests
• Updated relevant documentation (docs/)
• Added a relevant changelog entry: clog add [section] [stanza] [message]

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(FOR ADMIN) Before merging

• Added appropriate labels to PR
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)
• Confirm added tests are consistent with the intended behavior of changes
• Ensure all tests pass

[codecov]

Codecov Report

Merging #334 into develop will not change coverage by %.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #334   +/-   ##
========================================
  Coverage    73.14%   73.14%           
========================================
  Files           73       73           
  Lines         3128     3128           
========================================
  Hits          2288     2288           
  Misses         733      733           
  Partials       107      107