github: remove build job

[ivanvc]

This job was migrated to the prow infrastructure in May (kubernetes/test-infra#32672). Deleting the GitHub workflow to remove duplicate jobs should be fine.

Part of kubernetes/test-infra#32754, kubernetes/k8s.io#6102.

Please read https://github.com/etcd-io/etcd/blob/main/CONTRIBUTING.md#contribution-flow.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.79%. Comparing base (bd93a00) to head (b5e68d8).
Report is 14 commits behind head on main.

❗ Current head b5e68d8 differs from pull request most recent head 3347d98

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Additional details and impacted files

see 11 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #18633      +/-   ##
==========================================
+ Coverage   68.75%   68.79%   +0.03%     
==========================================
  Files         420      420              
  Lines       35522    35522              
==========================================
+ Hits        24423    24436      +13     
+ Misses       9677     9663      -14     
- Partials     1422     1423       +1     

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[ivanvc]

/retest

[jmhbnz]

LGTM - https://testgrid.k8s.io/sig-etcd-presubmits#pull-etcd-build is behaving nicely, thanks @ivanvc

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahrtr, ivanvc, jmhbnz, serathius

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