chore: support linux-arm64 for SpannerLib .NET gRPC

[olavloite]

Adds support for using the .NET SpannerLib wrapper on linux-arm64.

[gemini-code-assist]

Summary of Changes

Hello @olavloite, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces support for the linux-arm64 architecture to the SpannerLib .NET gRPC wrapper. This enhancement enables the use of SpannerLib on systems with ARM64-based Linux distributions. The changes include modifications to the build scripts to compile the gRPC server for the new architecture, as well as updates to the .NET wrapper to correctly load the corresponding native binary.

Highlights

• New Architecture Support: Adds support for the linux-arm64 architecture to the SpannerLib .NET gRPC wrapper.
• Build Script Modification: The build scripts for both the gRPC server and the .NET wrapper have been updated to include the linux-arm64 architecture.
• Code Update: The .NET server code has been updated to correctly identify and load the native binary for the linux-arm64 architecture.

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[gemini-code-assist]

Code Review

This pull request adds support for linux-arm64 to the SpannerLib .NET gRPC wrapper. The changes correctly add build steps for the new architecture in the shell scripts and update the C# code to locate the binary. However, I've identified a critical issue where the new binary is not included in the .NET project file, which would prevent it from being packaged and cause a runtime failure. Additionally, I've provided suggestions to refactor the build scripts to improve maintainability by reducing code duplication.

[olavloite]

/gemini review

[gemini-code-assist]

Code Review

This pull request effectively adds support for linux-arm64 to the SpannerLib .NET gRPC wrapper. The changes are well-implemented across the build scripts, C# server logic, and project file. I particularly appreciate the refactoring of the shell scripts to use functions, which significantly improves maintainability and readability. I've provided a couple of minor suggestions to further refine the shell scripts for better robustness and idiomatic usage.

[bhatt4982]

LGTM...