userspace: implement OSS ksuinit

.github/workflows/ksuinit.yml

@@ -0,0 +1,57 @@
+name: Build ksuinit
+on:
+  workflow_call:
+    inputs:
+      target:
+        required: true
+        type: string
+      os:
+        required: false
+        type: string
+        default: ubuntu-latest
+      pack_lkm:
+        required: false
+        type: boolean
+        default: true
+      use_cache:
+        required: false
+        type: boolean
+        default: true
+jobs:
+  build:
+    runs-on: ${{ inputs.os }}
+    steps:
+    - name: Checkout Repository
+      uses: actions/checkout@v4
+      with:
+        fetch-depth: 0
+
+    - name: Setup Rust
+      run: |
+        rustup update stable
+        rustup target add aarch64-linux-android
+
+    - name: Set Rust & Android linker
+      run: |
+        TOOLCHAIN="$ANDROID_NDK/toolchains/llvm/prebuilt/linux-x86_64"
+        if [ ! -d "$TOOLCHAIN" ]; then
+          echo "Android NDK not found at $ANDROID_NDK"
+          exit 1
+        fi
+        echo "CARGO_TARGET_AARCH64_LINUX_ANDROID_LINKER=$TOOLCHAIN/bin/aarch64-linux-android21-clang" >> $GITHUB_ENV
+
+    - name: Cache ksuinit
+      uses: Swatinem/rust-cache@v2
+      with:
+        workspaces: userspace/ksuinit
+        cache-targets: false
+
+    - name: Build ksuinit
+      run: |
+        cargo build --target ${{ inputs.target }} --release --manifest-path ./userspace/ksuinit/Cargo.toml
+
+    - name: Upload ksuinit artifact
+      uses: actions/upload-artifact@v4
+      with:
+        name: ksuinit-${{ inputs.target }}
+        path: userspace/ksuinit/target/**/release/ksuinit