[SRU] Enable ppc64el for .NET 8 on Noble

[Mateus Rodrigues de Morais]

Upload available in PPA: https://launchpad.net/~dotnet-bootstrap/+archive/ubuntu/dotnet8.0.108-noble-stage2

[ Impact ]

 * This SRU aims to enable the ppc64el architecture on .NET 8 targeting Ubuntu
   24.04 (Noble Numbat). This architecture has already been enabled for .NET
   8 on Oracular Oriole.

 * This came up as a request from IBM [0] and is now part of the .NET team's
   roadmap for the Oracular Oriole cycle.

 * Per the changelog of the package in the PPA, the changes introduced in this
   upload are only related to the enablement of ppc64el.

[ Test Plan ]

 * On a ppc64el machine, run the steps outlined in the .NET SRU Test Plan
   document [1].

[ Where problems could occur ]

 * The changes introduced in this upload have already been tested by IBM [0]
   in a PPA upload made available to them.

 * ppc64el has also been enabled for .NET 8 on Oracular.

 * The patches introduced to fix various FTBFS and autopkgtest failures on
   ppc64el are only modifying parameters in unit test projects within the .NET
   code-base as well as the autopkgtest testrunner code-base and its related
   libraries. These should not impact "shippable" products that land in the
   final binary packages.

 * If a problem occurs, it would be limited to .NET on ppc64el and will show
   up when using the product with normal day-to-day operations, which the test
   plan should be able to reproduce.

[ Other Info ]

 * The ppc64el build will require a bootstrap once it hits -proposed. The
   bootstrap package has been prepared and is available in a PPA [2]. It will
   be uploaded to the Ubuntu Bootstrap PPA by an Archive Admin once we're
   ready to bootstrap.

 * When this upload hits -proposed, the ppc64el build will stay in dependency
   wait status until the bootstrap package is uploaded and the Launchpad team
   triggers the bootstrap. The .NET team (Toolchains/Foundations) will drive
   the coordination of these tasks once we're there.

[0] https://bugs.launchpad.net/ubuntu/noble/+source/dotnet8/+bug/2064530
[1] https://github.com/canonical/dotnet-source-build/blob/main/docs/SRUTestPlan.md
[2] https://launchpad.net/~dotnet-bootstrap/+archive/ubuntu/dotnet8.0.107-noble-stage1-ppc64el

[Mateus Rodrigues de Morais (mateus-morais)]

PPA autopkgtest results:

- amd64 [PASS]: https://autopkgtest.ubuntu.com/results/autopkgtest-noble-dotnet-bootstrap-dotnet8.0.108-noble-stage2/noble/amd64/d/dotnet8/20240814_124546_77587@/log.gz
- arm64 [PASS]: https://autopkgtest.ubuntu.com/results/autopkgtest-noble-dotnet-bootstrap-dotnet8.0.108-noble-stage2/noble/arm64/d/dotnet8/20240814_134742_8229b@/log.gz
- ppc64el [PASS]: https://autopkgtest.ubuntu.com/results/autopkgtest-noble-dotnet-bootstrap-dotnet8.0.108-noble-stage2/noble/ppc64el/d/dotnet8/20240814_125947_63a82@/log.gz
- s390x: current networking issues in s390x runners are causing autopkgtests to fail, but I'm not expecting them to fail once infra is back up.

[Łukasz Zemczak (sil2100)]

Hello Mateus, or anyone else affected,

Accepted dotnet8 into noble-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/dotnet8/8.0.108-8.0.8-0ubuntu1~24.04.2 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, what testing has been performed on the package and change the tag from verification-needed-noble to verification-done-noble. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-noble. In either case, without details of your testing we will not be able to proceed.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance for helping!

N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.

[Łukasz Zemczak (sil2100)]

The bootstrap binaries have been uploaded to the bootstrap PPA. You can proceed with pinging the Launchpad team to switch on the bootstrap archive and re-run.

[Mateus Rodrigues de Morais (mateus-morais)]

Verification results:

- Autopkgtests are passing [0].
- Package dotnet8 is installable in a ppc64el Ubuntu machine.
- The steps described in the SRU test plan document [1] were executed successfully in a ppc64el Ubuntu machine with this version of dotnet8 installed.

[0] https://autopkgtest.ubuntu.com/results/autopkgtest-noble/noble/ppc64el/d/dotnet8/20240903_173616_e6cff@/log.gz
[1] https://github.com/canonical/dotnet-source-build/blob/main/docs/SRUTestPlan.md