Add XB1 builders and runner

[isarkis]

b/266878119

[datadog-cobalt-youtube]

Datadog Report

Branch report: xb1
Commit report: b3757f8

✅ cobalt_sandbox: 0 Failed, 0 New Flaky, 33835 Passed, 0 Skipped, 29m 13.03s Wall Time

[datadog-cobalt-youtube]

Datadog Report

Branch report: xb1
Commit report: f9f630e

✅ cobalt_sandbox: 0 Failed, 0 New Flaky, 33883 Passed, 0 Skipped, 23m 48.96s Wall Time

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.17%. Comparing base (18ebe18) to head (d1663fc).
Report is 1378 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #513      +/-   ##
==========================================
+ Coverage   54.00%   55.17%   +1.16%     
==========================================
  Files         182      188       +6     
  Lines        3018     3389     +371     
==========================================
+ Hits         1630     1870     +240     
- Misses       1388     1519     +131     

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[datadog-cobalt-youtube]

Datadog Report

Branch report: xb1
Commit report: 24efb51

✅ cobalt_sandbox: 0 Failed, 0 New Flaky, 27483 Passed, 1 Skipped, 5m 23.58s Wall Time

[datadog-cobalt-youtube]

Datadog Report

Branch report: xb1
Commit report: c42690e

✅ cobalt_sandbox: 0 Failed, 0 New Flaky, 29487 Passed, 1 Skipped, 11m 44.42s Wall Time

[TyHolc]

I finally got around to fixing my Docker issues locally and gave this a try. I initially got an error running with these Dockerfiles (same as b/255809507), but once the folder was created it built fine. I also tried running with @arjungm's changes at go/cobalt-cl/272980 and that worked as well.

[isarkis]

go/cobalt-cl/272980

Should we rebase this PR and try running XB1 build again?

[TyHolc]

go/cobalt-cl/272980

Should we rebase this PR and try running XB1 build again?

Yeah, we can try that.

Even without that change though the compile failures from the previous build shouldn't be happening, and weren't happening locally.

[datadog-cobalt-youtube]

Datadog Report

Branch report: xb1
Commit report: d1663fc
Test service: cobalt_sandbox

✅ 0 Failed, 29855 Passed, 1 Skipped, 10m 9.26s Wall Time