[Issue 21519] New: [CI] Code coverage pipeline is only ran for Linux x86_64

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21519

          Issue ID: 21519
           Summary: [CI] Code coverage pipeline is only ran for Linux
                    x86_64
           Product: D
           Version: D2
          Hardware: All
                OS: Windows
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: ibuclaw at gdcproject.org

First raised as a hindrance for validating bug fixes for other platforms in
this PR: https://github.com/dlang/dmd/pull/12080

Currently, CircleCI is the only pipeline that builds with coverage, sending the
results to CodeCov.  This pipeline only runs on Linux x86_64, so changes that
are intended to fix OSX and Windows (and others) are never reported on.

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