adding support for linux-ppc64le for building and packaging

[adilhusain-s]

This pull request introduces support for the linux-ppc64le runtime across various build and packaging scripts. The changes ensure compatibility with this architecture by updating runtime lists, handling specific build configurations, and dynamically determining host architecture for packaging.

Build system updates

• Added linux-ppc64le to the list of supported runtimes in Start-PSBuild and New-PSOptions functions, enabling build processes for this architecture. [1] [2]
• Updated the Fix steps section to disable ReadyToRun compilation, treat warnings as non-errors, and disable analyzers specifically for linux-ppc64le to address NETSDK1094 errors.
• Added handling for linux-ppc64le in the Clear-NativeDependencies function to ensure proper cleanup of native dependencies.

Packaging system updates

• Modified Start-PSPackage to dynamically determine the host architecture for linux-ppc64le, mapping it to ppc64el as used by Debian.
• Updated the HostArchitecture property in Start-PSPackage to use the dynamically determined value instead of the hardcoded "amd64".
• Added ppc64el to the allowed values for the HostArchitecture parameter in New-UnixPackage, ensuring compatibility with RPM and Debian packaging formats.

PR Summary

Adds first-class support for building and packaging PowerShell on the linux-ppc64le runtime. This expands PowerShell's architecture support to include IBM Power systems, enabling developers to build, clean, and package PowerShell natively for ppc64le.

PR Context

This PR aligns with IBM’s initiative to enhance open source tooling on IBM Power, Z, and LinuxONE platforms. IBM recently announced GitHub Actions runners are now available on these platforms, enabling seamless CI/CD pipelines for open source projects:
🔗 Expanding Open Source Access: GitHub Actions Now Available for IBM Power, IBM Z and IBM LinuxONE

Additionally, this work is directly relevant to the effort to include PowerShell in the gaplib LXD image used for GitHub Actions runners on ppc64le, which currently lacks the PowerShell binary required by workflows like actions/python-versions. The related tracking issue is:
🔗 ppc64le/gaplib Issue #2: include powershell in lxd image

By enabling a clean and compatible build for linux-ppc64le, this PR facilitates native PowerShell availability on these runners, eliminating a critical gap in the CI ecosystem for ppc64le.

PR Checklist

• PR has a meaningful title

  • Use the present tense and imperative mood when describing your changes

• Summarized changes

• Make sure all .h, .cpp, .cs, .ps1 and .psm1 files have the correct copyright header

• This PR is ready to merge. If this PR is a work in progress, please open this as a Draft Pull Request and mark it as Ready to Review when it is ready to merge.

• Breaking changes

  • None

• User-facing changes

  • Not Applicable

• Testing - New and feature

  • N/A or can only be tested interactively on ppc64le systems

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