ci: add ci

- directly copied from lastpipebender

.github/workflows/ci.yml

@@ -0,0 +1,65 @@
+name: CI
+
+on:
+  workflow_dispatch:
+  pull_request:
+    branches:
+      - dev
+      - master
+      - extended
+      - stable
+      - '**-feature-**'
+    paths-ignore:
+      - 'README.md'
+      - 'doc/**'
+      - 'fastlane/**'
+      - 'assets/**'
+      - '.github/**/*.md'
+      - '.github/FUNDING.yml'
+      - '.github/ISSUE_TEMPLATE/**'
+  push:
+    branches:
+      - dev
+      - master
+      - extended
+      - stable
+      - '**-feature-**'
+    paths-ignore:
+      - 'README.md'
+      - 'doc/**'
+      - 'fastlane/**'
+      - 'assets/**'
+      - '.github/**/*.md'
+      - '.github/FUNDING.yml'
+      - '.github/ISSUE_TEMPLATE/**'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    permissions: write-all
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up JDK
+        uses: actions/setup-java@v4
+        with:
+          java-version: 21
+          distribution: "temurin"
+          cache: 'gradle'
+
+      - name: Build debug APK and run jvm tests
+        run: ./gradlew assembleDebug lintDebug testDebugUnitTest --stacktrace -DskipFormatKtlint
+
+      - name: Generate checksum
+        run: |
+          sha256sum app/build/outputs/apk/debug/*.apk > app/build/outputs/apk/debug/checksums.txt
+          echo "::notice::$(cat app/build/outputs/apk/debug/checksums.txt)"
+
+      - name: Upload APK
+        uses: actions/upload-artifact@v4
+        with:
+          name: app
+          path: app/build/outputs/apk/debug/*.apk