feat(bindings/dotnet): build and package the linux-arm64 native library - #8336
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Add a `linux-aarch_64` classifier that maps to `aarch64-unknown-linux-gnu`, build it on a native `ubuntu-24.04-arm` runner, and pack the resulting library under `runtimes/linux-arm64/native/` so NuGet resolves it on Linux arm64 hosts. Download the native artifacts into one directory per artifact: the Linux x64 and Linux arm64 builds share the `libopendal_dotnet.so` file name, so merging them into a single directory would drop one of the two libraries. Also run the dotnet binding CI test job on `ubuntu-24.04-arm`, so the arm64 build and tests are exercised on every pull request instead of only at release time.
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Sep 23, 2026
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Which issue does this PR close?
None
Rationale for this change
The OpenDAL NuGet package ships native libraries for win-x64, linux-x64 and osx-arm64 only, so DllImport("opendal_dotnet") finds nothing on Linux arm64.
GitHub provides native arm64 runners, and this repository already builds the Java and Ruby bindings on ubuntu-24.04-arm.
What changes are included in this PR?
Are there any user-facing changes?
Yes. The NuGet package works on Linux arm64.
Breaking changes
None
AI Usage Statement
Harness: Claude Code
Model: Claude Opus 5 (claude-opus-5)
Effort: xhigh
Role: Wrote the build and workflow changes. Validated the arm64 library by cross-compiling it and running a
qemu-aarch64FFI smoke test, and checkeddotnet packwith placeholder native libraries to confirm all four runtime identifier paths land in the package. Nothing has run on real arm64 hardware yet; the CI job added here is the first.