android: Add github action

This lives under a separate workflow so it can have different ignore paths.

.github/workflows/build_android.yml

@@ -0,0 +1,79 @@
+---
+on:
+  workflow_dispatch:
+  push:
+    paths-ignore:
+      - 'build/**'
+      - 'doc/**'
+      - 'python/**'
+      - 'subprojects/**'
+      - 'systemd/**'
+      - 'win32/**'
+    branches:
+      - master
+      - v0.23.x
+  pull_request:
+    paths-ignore:
+      - 'build/**'
+      - 'doc/**'
+      - 'python/**'
+      - 'subprojects/**'
+      - 'systemd/**'
+      - 'win32/**'
+    branches:
+      - master
+      - v0.23.x
+
+permissions:
+  contents: read #  to fetch code (actions/checkout)
+
+jobs:
+  build-android:
+    runs-on: ubuntu-22.04
+    steps:
+      - id: checkout
+        uses: actions/checkout@v4
+
+      - id: cache-ccache
+        uses: hendrikmuhs/ccache-action@v1
+        with:
+          key: android
+
+      - name: Set up JDK 17
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'zulu'
+          java-version: 17
+
+      - name: Install dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y --no-install-recommends \
+            ninja-build \
+            quilt 
+          pip3 install --user meson==0.56.2
+            
+      - name: Install SDK
+        run: |
+          cd /opt
+          mkdir -p android-sdk/cmdline-tools/latest
+          wget https://dl.google.com/android/repository/commandlinetools-linux-10406996_latest.zip
+          unzip commandlinetools-linux-10406996_latest.zip -d commandlinetools
+          mv commandlinetools/cmdline-tools/* ./android-sdk/cmdline-tools/latest
+          yes | /opt/android-sdk/cmdline-tools/latest/bin/sdkmanager --update
+          yes | /opt/android-sdk/cmdline-tools/latest/bin/sdkmanager --licenses
+          /opt/android-sdk/cmdline-tools/latest/bin/sdkmanager --install "build-tools;29.0.3" "platforms;android-29" "ndk;26.1.10909125"
+          cd -
+
+      - name: Build
+        run: |
+          mkdir -p output/android
+          cd ./output/android
+          ../../android/build.py /opt/android-sdk /opt/android-sdk/ndk/26.1.10909125 arm64-v8a \
+            --buildtype=debugoptimized -Db_ndebug=true \
+            -Dwrap_mode=forcefallback 
+
+          cd -
+          cd ./android
+          ./gradlew assembleDebug
+