[1.7.x] Buildkite 3.0

[NorseGaud]

Change Description

This pull request introduces the decentralized Buildkite pipeline 3.0 from the other pull requests linked below. However, we decided not to include a Travis CI pipeline for release/1.7.x because it will be deprecated with release/2.0.x, and we expect little community contribution to this older release.

This branch is considered stable and is being used to collect metrics, so please treat this like develop and make changes on branches off of trav-poc-1.7.x and test them before merging them back in.

Changes

• Buildkite YAML
• Scripts
• Docker files

Tested

• Buildkite build 16603 — baseline
• Buildkite beta
  • Build 1801 — base case
  • Build 1804 — long-running tests
    • SKIP_LONG_RUNNING_TESTS='false'

See Also

• Pull request 7815 — eos:release/1.7.x base
• Pull request 7839 — eos:release/1.8.x base
• Pull request 7834 — eos:master base
• Pull request 7700 — eos:develop base
• eos-buildkite-pipelines pull request 54 — pipeline decentralization
• Pull request 7696 — Travis CI beta testing
• Pull request 7622 — Travis CI alpha testing

Consensus Changes

• Consensus Changes
  None.

API Changes

• API Changes
  None.

Documentation Additions

• Documentation Additions
  None.