ci: Add GitHub Actions workflow + bump to v2.0.0

- Added build-apk.yml for automated APK builds on push
- Auto-creates GitHub Release on version tags (v*)
- Bumped version to v2.0.0 (major: Gemini → OpenAI-compatible LLM)

Author: Baker

.github/workflows/build-apk.yml

@@ -0,0 +1,62 @@
+name: Build Release APK
+
+on:
+  push:
+    branches: [ master ]
+    tags: [ 'v*' ]
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up JDK 17
+        uses: actions/setup-java@v4
+        with:
+          java-version: '17'
+          distribution: 'temurin'
+
+      - name: Setup Android SDK
+        uses: android-actions/setup-android@v3
+
+      - name: Grant execute permission for gradlew
+        run: chmod +x gradlew
+
+      - name: Set SDK path
+        run: echo "sdk.dir=$ANDROID_HOME" > local.properties
+
+      - name: Build Release APK
+        run: ./gradlew assembleDefaultRelease --no-daemon
+
+      - name: Upload APK artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: AirNote-release
+          path: app/build/outputs/apk/default/release/*.apk
+
+  release:
+    needs: build
+    runs-on: ubuntu-latest
+    if: startsWith(github.ref, 'refs/tags/v')
+
+    permissions:
+      contents: write
+
+    steps:
+      - name: Download APK artifact
+        uses: actions/download-artifact@v4
+        with:
+          name: AirNote-release
+          path: ./apk
+
+      - name: Create GitHub Release
+        uses: softprops/action-gh-release@v2
+        with:
+          files: ./apk/*.apk
+          generate_release_notes: true
+          draft: false
+          prerelease: false

app/build.gradle.kts

@@ -34,8 +34,8 @@ android {
         applicationId = "com.babelsoftware.airnote"
         minSdk = 26
         targetSdk = 36
-        versionCode = 1
-        versionName = "v1.6.1"
+        versionCode = 2
+        versionName = "v2.0.0"
         vectorDrawables {
             useSupportLibrary = true
         }