perf(android): cache gradle, pin NDK, use lld linker

.github/workflows/tauri-build.yml

@@ -324,6 +324,7 @@ jobs:
       VITE_IS_RELEASE_TAG: ${{ needs.setup-release.outputs.nightly == 'true' && 'true' || '' }}
       CARGO_INCREMENTAL: 0
       CARGO_TERM_COLOR: always
+      MISE_ENV: tauri
       NODE_OPTIONS: --max-old-space-size=8192
       RUST_TARGETS: aarch64-linux-android armv7-linux-androideabi i686-linux-android x86_64-linux-android
       ANDROID_KEY_BASE64: ${{ secrets.ANDROID_KEY_BASE64 }}
@@ -341,6 +342,10 @@ jobs:
         with:
           tauri: 'true'
 
+      - name: Setup Android SDK + NDK
+        shell: bash
+        run: mise run tauri:setup:android
+
       - name: Add Rust targets
         shell: bash
         run: rustup target add $RUST_TARGETS
@@ -350,10 +355,13 @@ jobs:
         with:
           workspaces: src-tauri
 
+      - name: Setup Gradle
+        uses: gradle/actions/setup-gradle@3f131e8634966bd73d06cc69884922b02e6faf92 # v6.2.0
+
       - name: Resolve NDK
         shell: bash
         run: |
-          echo "NDK_HOME=$ANDROID_HOME/ndk/$(ls -1 "$ANDROID_HOME/ndk" | sort -V | tail -n1)" >> "$GITHUB_ENV"
+          echo "NDK_HOME=$ANDROID_HOME/ndk/$ANDROID_NDK_VERSION" >> "$GITHUB_ENV"
 
       - name: Stamp release version into tauri.conf.json
         shell: bash

mise.tauri.toml

@@ -1,6 +1,9 @@
 # Tauri-specific dev tools and system dependencies.
 # Loaded via `MISE_ENV=tauri` (set by `mise run setup:tauri` or CI).
 
+[env]
+ANDROID_NDK_VERSION = "29.0.14206865"
+
 [settings]
 idiomatic_version_file_enable_tools = ["pnpm", "node", "rust"]
 experimental = true

mise.toml

@@ -65,6 +65,15 @@ description = "Install Tauri tools and system packages"
 run = ["mise install", "mise bootstrap packages apply --yes"]
 env = { MISE_ENV = "tauri" }
 
+[tasks."tauri:setup:android"]
+description = "Install Android SDK packages + NDK (no Android Studio needed)"
+depends = ["tauri:setup"]
+env = { MISE_ENV = "tauri" }
+run = [
+  "yes | sdkmanager --licenses",
+  'sdkmanager "platform-tools" "platforms;android-36" "build-tools;35.0.0" "ndk;{{env.ANDROID_NDK_VERSION}}"',
+]
+
 [tasks."tauri:setup:macos"]
 description = "Install Xcode"
 confirm = { message = "Install Xcode? (required for Tauri)", default = "no" }

src-tauri/build.rs

@@ -13,6 +13,11 @@ fn main() {
         println!("cargo:rustc-link-arg-bins=-Wl,-rpath,/usr/lib/swift");
     }
 
+    // Use the NDK's lld linker for faster Android linking.
+    if std::env::var("CARGO_CFG_TARGET_OS").as_deref() == Ok("android") {
+        println!("cargo:rustc-link-arg=-fuse-ld=lld");
+    }
+
     tauri_typegen::BuildSystem::generate_at_build_time()
         .expect("Failed to generate TypeScript bindings");
 

src-tauri/gen/android/gradle.properties

@@ -10,7 +10,9 @@ org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
 # When configured, Gradle will run in incubating parallel mode.
 # This option should only be used with decoupled projects. More details, visit
 # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
-# org.gradle.parallel=true
+org.gradle.parallel=true
+# Enable the Gradle build cache so task outputs are reused across runs.
+org.gradle.caching=true
 # AndroidX package structure to make it clearer which packages are bundled with the
 # Android operating system, and which are packaged with your app"s APK
 # https://developer.android.com/topic/libraries/support-library/androidx-rn