Zip build directories before uploading

[jingtang10]

IMPORTANT: All PRs must be linked to an issue (except for extremely trivial and straightforward changes).

Description
Zip build directories before uploading

This reduces the total uploading time from ~40m to ~5m.

Alternative(s) considered
NA

Type
Choose one: Builds

Screenshots (if applicable)

Checklist

• I have read and acknowledged the Code of conduct
• I have read the Contributing page
• I have signed the Google Individual CLA, or I am covered by my company's Corporate CLA
• I have discussed my proposed solution with code owners in the linked issue(s) and we have agreed upon the general approach
• I have run ./gradlew spotlessApply and ./gradlew spotlessCheck to check my code follows the style guide of this project
• I have run ./gradlew check and ./gradlew connectedCheck to test my changes locally
• I have built and run the reference app(s) to verify my change fixes the issue and/or does not break the reference app(s)

[codecov]

Codecov Report

Merging #1157 (71e3aee) into master (e2a8d0a) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #1157   +/-   ##
=========================================
  Coverage     84.51%   84.51%           
  Complexity      608      608           
=========================================
  Files           134      134           
  Lines         10276    10276           
  Branches        756      756           
=========================================
  Hits           8685     8685           
  Misses         1215     1215           
  Partials        376      376           

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[aditya-07]

LGTM! Hopefully our CI builds will be much faster now :)