Add Android lint & test to GitHub CI

This commit implements the Android Lint and Tests into the pipeline to
check if everything is ok at least with the written unit tests.

Closes #6678

.github/workflows/kotlin-test.yml

@@ -0,0 +1,64 @@
+name: Kotlin CI
+
+on:
+  push:
+    branches-ignore:
+      - master
+    paths: [ "app-android/**" ]
+
+jobs:
+  test-kotlin:
+    runs-on: ubuntu-latest
+    env:
+      java-version: 21
+      java-distribution: 'temurin'
+      node-version: 20.11.1
+      TZ: "Europe/Berlin"
+    permissions:
+      actions: none
+      checks: none
+      contents: read
+      deployments: none
+      id-token: none
+      issues: none
+      discussions: none
+      packages: none
+      pages: none
+      pull-requests: none
+      repository-projects: none
+      security-events: none
+      statuses: none
+
+    steps:
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 #v4.1.1
+      - name: Use Node.js ${{ env.node-version }}
+        uses: actions/setup-node@v3
+        with:
+          node-version: ${{ env.node-version }}
+          cache: 'npm'
+          cache-dependency-path: '**/package-lock.json'
+      - name: Get better-sqlite3 cached location
+        run: |
+          echo "better_sqlite3_path=$(node buildSrc/getNativeCacheLocation.js better-sqlite3)" >> $GITHUB_ENV
+      - name: Try to use cached better-sqlite3
+        uses: actions/cache@v3
+        with:
+          path: ${{ env.better_sqlite3_path }}
+          key: ${{ env.better_sqlite3_path }}
+      - name: Install packages
+        run: npm ci && npm run build-packages
+      - name: Build WebApp
+        run: node webapp
+      - name: Set up JDK ${{ env.java-version }}
+        uses: actions/setup-java@99b8673ff64fbf99d8d325f52d9a5bdedb8483e9 #4.2.1
+        with:
+          java-version: ${{ env.java-version }}
+          distribution: ${{ env.java-distribution }}
+      - name: Setup Android SDK
+        uses: android-actions/setup-android@07976c6290703d34c16d382cb36445f98bb43b1f #3.2.0
+      - name: Lint
+        working-directory: ./app-android
+        run: ./gradlew lint --quiet
+      - name: Test
+        working-directory: ./app-android
+        run: ./gradlew test