ci: add android arm64 build and release

[ykhrustalev]

---

Overview

Add Android arm64 build to CI (build.yml) and release pipeline (release.yml) so that the same set of tools and server binaries shipped for Linux are also available for Android.

The job cross-compiles using the Android NDK on ubuntu-latest, following the same cmake flags and patterns as the existing ubuntu-cpu release job. The only android-specific additions are:

• Toolchain file, ABI (arm64-v8a), and platform (android-28)
• -DGGML_OPENMP=OFF — not available in NDK cross-compile
• -DLLAMA_OPENSSL=OFF — no system SSL, matches existing build-android.yml

Requirements

• I have read and agree with the contributing guidelines
• AI usage disclosure: YES

[Aflah012]

I think this is great (if actually implemented), I want to try it in Termux.

[ykhrustalev]

cc @ggml-org/ci @ngxson

[ykhrustalev]

The Android -Wmissing-prototypes failure on ma_android_sdk_version in vendor/miniaudio/miniaudio.h comes from upstream miniaudio. Filed a fix there: mackron/miniaudio#1116.

[ngxson]

Should we skip building examples? If I understand correctly, the NDK only requires .so dynamic library, right?

[ykhrustalev]

@ngxson my intention is to have

• llama-cli
• llama-completions
• llama-benchmarks
• llama-server
• .so for the per-arm instruction level

[ngxson]

I don't work specifically on android part of the project, but I think it may worth trying this. CC @ggml-org/ci for an additional review. Thanks!

[CISC]

Why is this not built on ARM?

Edit: Asking for a friend who has too many jobs queued on ubuntu-latest. :)

[ykhrustalev]

I didn't know they exist until now, I will update

[ykhrustalev]

I tried elsewhere and the android actions are not suitable for the arm node yet, so it would be tradeoff: using the existing actions on x86 or fixing them for the arm

Warning: Unable to compute a complete list of dependencies.
/home/runner/work/_actions/android-actions/setup-android/v4/dist/index.js:22290
        error2 = new Error(`The process '${this.toolPath}' failed with exit code ${this.processExitCode}`);
                 ^

Error: The process '/home/runner/.android/sdk/cmdline-tools/20.0/bin/sdkmanager' failed with exit code 1
    at _ExecState._setResult (/home/runner/work/_actions/android-actions/setup-android/v4/dist/index.js:22290:18)
    at _ExecState.CheckComplete (/home/runner/work/_actions/android-actions/setup-android/v4/dist/index.js:22276:12)
    at ChildProcess.<anonymous> (/home/runner/work/_actions/android-actions/setup-android/v4/dist/index.js:22181:17)
    at ChildProcess.emit (node:events:508:28)
    at maybeClose (node:internal/child_process:1100:16)
    at ChildProcess._handle.onexit (node:internal/child_process:305:5)