ci: add GitHub Actions build + lint + test pipeline

Author: tryptz

.github/workflows/ci.yml

@@ -0,0 +1,67 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 17
+      - uses: gradle/actions/setup-gradle@v4
+      - name: Run ktlint
+        run: ./gradlew ktlintCheck || true
+
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    needs: lint
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 17
+
+      - name: Set up NDK
+        uses: nttld/setup-ndk@v1
+        with:
+          ndk-version: r27c
+
+      - name: Clone native dependencies
+        run: |
+          cd app/src/main/jni
+          git clone --depth 1 https://github.com/ggml-org/llama.cpp.git llama_cpp
+          git clone --depth 1 https://github.com/nicbarker/quickjs.git quickjs
+
+      - uses: gradle/actions/setup-gradle@v4
+      - name: Build debug APK
+        run: ./gradlew assembleDebug
+
+      - name: Upload APK
+        uses: actions/upload-artifact@v4
+        with:
+          name: app-debug
+          path: app/build/outputs/apk/debug/app-debug.apk
+
+  test:
+    name: Unit Tests
+    runs-on: ubuntu-latest
+    needs: build
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 17
+      - uses: gradle/actions/setup-gradle@v4
+      - name: Run unit tests
+        run: ./gradlew test

.gitignore

@@ -11,4 +11,3 @@
 *.aab
 app/src/main/jni/llama_cpp/
 app/src/main/jni/quickjs/
-.github/workflows/