feat: 1665 implement custom sharding -- android

[pawelpasterz]

Android part for #1665

Detailed documentation

This is the first implementation of the custom sharding feature, below assumptions were made:

1. flank does not validate provided json -- we trust the user that he/she knows what is doing
2. sharding-json is the source of truth -- no smart sharding applied
3. custom sharding can be launched together with robo/game loop test

Test Plan

How do we know the code works?

1. build flank ./gradlew flankFullRun
2. create config yml

   gcloud:
     app: [PATH]/app-debug.apk
     robo-script: [PATH]/MainActivity_robo_script.json
     use-orchestrator: false
   flank:
     max-test-shards: 2
     additional-app-test-apks:
       - test: [PATH]/app-single-success-debug-androidTest.apk
       - test: [PATH]/app-multiple-error-debug-androidTest.apk
       - test: [PATH]/app-multiple-success-debug-androidTest.apk
     disable-results-upload: true
     disable-usage-statistics: true
   

3. run flank firebase test android run -c=[YOUR CONFIG] --dump-shards
4. copy android_shards.json, rename it and play around with shards, example: add another shard, move tests etc
5. add sharding-json: [PATH TO YOUR CUSTOM SHARDING JSON] to your config yaml
6. run flank firebase test android run -c=[YOUR CONFIG] --dump-shards
7. observe new sharding in android_shards.json (notice that shards are properly assigned to app-test apk pairs)
8. run flank firebase test android run -c=[YOUR CONFIG]
9. test run should proceed and end normally with sharding that you created

Note:

• matrices ids don't matter when preparing custom sharding
• shards id as well

Checklist

• Documented
• Unit tested
• Integration tests updated

[github-actions]

CLA Assistant Lite bot All contributors have signed the CLA ✍️ ✅

[github-actions]

Timestamp: 2021-04-06 07:21:05
Buildscan url for ubuntu-workflow run 721666364
https://gradle.com/s/rt7yp4pljxvge

[Sloox]

Minor comments and fixes.

[piotradamczyk5]

@flank-it

[github-actions]

Integration tests failed ❌
Windows status failure - Build scan:
MacOS status failure - Build scan: https://gradle.com/s/yqmy6ee6blu74
Linux status failure - Build scan: https://gradle.com/s/fqwpbzskzn7nc
Workflow run https://github.com/Flank/flank/actions/runs/705044229

[pawelpasterz]

Integration tests failed ❌
Windows status failure - Build scan:
MacOS status failure - Build scan: https://gradle.com/s/yqmy6ee6blu74
Linux status failure - Build scan: https://gradle.com/s/fqwpbzskzn7nc
Workflow run https://github.com/Flank/flank/actions/runs/705044229

Quota limit exceeded...

[jan-goral]

Great job!!! 🚀 Let's wait with approval until quota refresh and run IT tests once again tomorrow.

[pawelpasterz]

@flank-it

[github-actions]

Integration tests succeed for all OSes ✅
Windows Build scan:
MacOS Build scan: https://gradle.com/s/xfyhelbqzqe3s
Linux Build scan: https://gradle.com/s/pvxklawz3wrxu
Workflow run https://github.com/Flank/flank/actions/runs/711062354

[pawelpasterz]

@jan-gogo IT pass, let me know if I should put some more effort into this PR or it's good to merge