Add Alpine Edge and Azure Linux bare VM testing

[richlander]

• Add Alpine Edge as a new leg in preparation for Alpine 3.22 support per Consider providing Alpine edge images dotnet-buildtools-prereqs-docker#1426
• Increase Arm64 coverage by switch to AL3 + Ubuntu
• Reformat the various architectures to make them more similar (and help avoid incorrect coverage)
• Add Azure Linux 3 VM (Azure Linux 3 VMs need to be updated dnceng#5602 should be fixed now)

[Copilot]

Pull Request Overview

This PR adds Alpine Edge and Azure Linux 3.0 VM testing legs, increases ARM64 coverage, and standardizes platform definitions.

• Introduce Alpine Edge variant and Azure Linux 3.0 for ARM64 and x64.
• Update conditionals to include extra and all-platform builds.
• Reformat platform sections for consistency.

Comments suppressed due to low confidence (4)

eng/pipelines/libraries/helix-queues-setup.yml:34

• The alias 'Ubuntu.2504.ArmArch.Open' is inconsistent with the existing 'Ubuntu.2504.Arm64.Open' pattern; consider renaming to 'Ubuntu.2504.Arm64.Open'.

-        - (Ubuntu.2504.ArmArch.Open)Ubuntu.2204.ArmArch.Open@mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-25.04-helix-arm64v8

eng/pipelines/libraries/helix-queues-setup.yml:36

• To match existing conventions, use 'AzureLinux.3.0.Arm64.Open' instead of 'AzureLinux.3.0.ArmArch.Open', and ensure casing is consistent.

-        - (AzureLinux.3.0.ArmArch.Open)Ubuntu.2204.ArmArch.open@mcr.microsoft.com/dotnet-buildtools/prereqs:azurelinux-3.0-helix-arm64v8

eng/pipelines/libraries/helix-queues-setup.yml:46

• The 'and' expression has only one argument, causing a syntax error. Change to 'if eq(parameters.platform, 'linux_musl_arm64')' or split into nested conditionals correctly.

-    - ${{ if and(eq(parameters.platform, 'linux_musl_arm64') }}:

eng/pipelines/libraries/helix-queues-setup.yml:54

• The shorthand 'azurelinux.3.amd64.open' doesn't match the defined alias 'AzureLinux.3.0.Amd64.Open'; use the full container spec or the exact alias.

-          - azurelinux.3.amd64.open

[richlander]

/azp run runtime-libraries-coreclr outerloop-linux

[azure-pipelines]

Azure Pipelines failed to run 1 pipeline(s).

[richlander]

Something seems wrong with CI. Only linker tests were run.

[richlander]

/azp run runtime-libraries-coreclr outerloop-linux

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[richlander]

/azp run runtime-libraries-coreclr outerloop-linux

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[richlander]

/azp run runtime-libraries-coreclr outerloop-linux

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[richlander]

/azp run runtime-extra-platforms

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[richlander]

Looks like there is one primary break due to these changes in VB tests, from Alpine Edge. The Azure Linux failures appear to be resolved.

System.TypeInitializationException : The type initializer for 'Microsoft.VisualBasic.Tests.FinancialTests' threw an exception.
---- System.FormatException : Failed to parse version string: '3.22.0_alpha20250108'
-------- System.FormatException : The input string '0_alpha20250108' was not in a correct format.

[richlander]

/azp run runtime-extra-platforms

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[richlander]

/azp run runtime-libraries-coreclr outerloop-linux

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[richlander]

• Outerloop failures on Linux look unrelated (and I've seen elsewhere).
• Extra platform failures are not on Linux

[richlander]

/azp run runtime-libraries-coreclr outerloop-linux

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[richlander]

/azp run runtime-libraries-coreclr outerloop-linux

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[richlander]

Looks like just one Alpine 3.21 issue. Alpine 3.21 isn't new. The only change is the underlying VM, back to Ubuntu (from Azure Linux 3). I could (and will eventually) change it back, but I'm worried that there somehow might be a kernel-specific issue. Hopefully this is just a change that slipped in from main. I'll watch the other PRs to see if it shows up.

@wfurt

    System.Net.Mail.Tests.SmtpClientSendMailTest_SendMailAsync.MultipleRecipients_Failure_All [FAIL]
      Assert.Null() Failure: Value is not null
      Expected: null
      Actual:   ParsedMailMessage { Attachments = [], Body = "body", Cc = "cc1@example.com, cc2@example.com", ContentType = text/plain; charset=us-ascii, From = "foo@example.com", ··· }
      Stack Trace:
        /_/src/libraries/System.Net.Mail/tests/Functional/SmtpClientSendMailTest.cs(310,0): at System.Net.Mail.Tests.SmtpClientSendMailTest`1.MultipleRecipients_Failure_All()
        --- End of stack trace from previous location ---
      Output:
        Server> 220 localhost
        Client> EHLO Da00CREX
        Server> 250-localhost, mock server here
              > 250 AUTH PLAIN LOGIN
        Client> MAIL FROM:<foo@example.com>
        Server> 250 Ok
        Client> RCPT TO:<bar@example.com>
        Server> 550 unknown recipient
        Client> RCPT TO:<baz@example.com>
        Server> 550 unknown recipient
        Client> RCPT TO:<cc1@example.com>
        Server> 550 unknown recipient
        Client> RCPT TO:<cc2@example.com>
        Server> 550 unknown recipient
        Client> DATA
        Server> 354 Start mail input; end with <CRLF>.<CRLF>
        Client> MIME-Version: 1.0
              > From: foo@example.com
              > To: bar@example.com, baz@example.com
              > Cc: cc1@example.com, cc2@example.com
              > Date: 19 May 2025 16:04:51 +0000
              > Subject: subject
              > Content-Type: text/plain; charset=us-ascii
              > Content-Transfer-Encoding: quoted-printable
              > 
              > body
              > 
              > .
        Server> 250 Ok: queued as 1219
        Client> QUIT
        Server> 221 Bye
  Finished:    System.Net.Mail.Functional.Tests

[richlander]

Oops. I was wrong. The failure is Arm32 specific, which was unchanged. False alarm.

[richlander]

/ba-g "Linux Arm32 and Windows issue unrelated to this change"

[richlander]

/azp run runtime-libraries-coreclr outerloop-linux

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[jkotas]

Thank you!

[richlander]

/ba-g "Failures are in test legs that we were not touching"