Refactor .drone.yml

[assafmo]

Matching PRs: https://github.com/enigmampc/enigma-core/pull/279 https://github.com/enigmampc/enigma-contract/pull/198

• Until we have a good enough testing framework: Test that a new worker joins the network and syncs correctly. (Cc: @lenak25)
• Add a cleanup step to the CI.
• Small refactoring.

[codecov[bot]]

Codecov Report

Merging #289 into develop will decrease coverage by 0.03%. The diff coverage is 44.44%.

@@             Coverage Diff             @@
##           develop     #289      +/-   ##
===========================================
- Coverage    77.38%   77.34%   -0.04%     
===========================================
  Files          104      104              
  Lines         4781     4777       -4     
===========================================
- Hits          3700     3695       -5     
- Misses        1081     1082       +1

Impacted Files	Coverage Δ
...ontroller/actions/tasks/PublishTaskResultAction.js	81.81% <100%> (ø)	:arrow_up:
...ontroller/actions/sync/AnnounceLocalStateAction.js	71.42% <100%> (+0.59%)	:arrow_up:
...r/controller/actions/sync/AnnounceContentAction.js	62.96% <18.18%> (-10.12%)	:arrow_down:
src/worker/state_sync/provider/Provider.js	86.66% <75%> (+0.95%)	:arrow_up:

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[assafmo]

@lenak25 Ready for your review 🦄

[lacabra]

@assafmo I warn about modifying .drone.yml "unilaterally" in one repo only. Right now, the drone files in the three main repos are all analogous and very similar, so that they are easy to maintain. @reuvenpo and I led the work on these files that got us to where we are. I would ask a review from either or both of us before merging this, when you feel this is ready.

[lacabra]

@assafmo In the latest build, all the integration tests pass, the 4th worker inits successfully, see this link, L12338:

worker_4     | 2020-01-23T19:57:40Z INFO [P2P-MainController] - success InitWorkerAction

but there is never a success syncing pipeline message, so the build times out and errors out.