Optimize CI

[omarismail94]

Simplify CI cache:

1. By caching the AVD, we avoid creating a new AVD for each of the instrumentation test steps. An example of this is here
2. Using Gradle Build Action avoids the need to use the cache step ourselves. See here for details

[codecov]

Codecov Report

Merging #1263 (8c1b002) into master (08c7d23) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #1263   +/-   ##
=========================================
  Coverage     84.17%   84.17%           
  Complexity      678      678           
=========================================
  Files           147      147           
  Lines         10735    10735           
  Branches        882      882           
=========================================
  Hits           9036     9036           
  Misses         1233     1233           
  Partials        466      466           

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[jingtang10]

adding @florina-muntenescu who authored the caching mechanism in case she has anything to add. Thanks @florina-muntenescu and @omarismail94.

[jingtang10]

@omarismail94 can you please elaborate the intended effects of this optimization?

[omarismail94]

@omarismail94 can you please elaborate the intended effects of this optimization?

Yeah, there are two

1. By caching the AVD, it avoids creating a new AVD for each of the instrumentation test steps. An example of this is here
2. Using Gradle Build Action avoids the need to use the cache step ourselves. See here for details

[jingtang10]

is this ready to go? looks good to me.