v1.18: [anza migration] ci (backport of #5)

[mergify]

This is an automatic backport of pull request #5 done by Mergify.
Cherry-pick of 16d08a0 has failed:

On branch mergify/bp/v1.18/pr-5
Your branch is up to date with 'origin/v1.18'.

You are currently cherry-picking commit 16d08a02a3.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	deleted:    .travis.yml
	modified:   README.md
	modified:   ci/buildkite-pipeline-in-disk.sh
	modified:   ci/buildkite-pipeline.sh
	modified:   ci/buildkite-solana-private.sh
	modified:   ci/channel-info.sh
	modified:   ci/dependabot-pr.sh
	modified:   ci/test-coverage.sh

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   .mergify.yml
	both modified:   ci/rust-version.sh

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

---

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (97f224a) 81.6% compared to head (587076d) 81.6%.

Additional details and impacted files

@@           Coverage Diff           @@
##            v1.18      #12   +/-   ##
=======================================
  Coverage    81.6%    81.6%           
=======================================
  Files         827      827           
  Lines      224081   224081           
=======================================
+ Hits       182925   182949   +24     
+ Misses      41156    41132   -24