workflow: Add Android build to CI matrix

.github/workflows/ci.yml

@@ -552,3 +552,156 @@ jobs:
       shell: bash
       run: |
         PYTHONHOME=~/python/usr/local PYTHONPATH=built node built/bin/run_tests.js tests
+
+  android:
+    if: "!contains(github.event.head_commit.message, '[skip ci]') && !contains(github.event.head_commit.message, '[ci skip]')"
+
+    strategy:
+      fail-fast: false
+
+      matrix:
+        include:
+        - android-abi: arm64-v8a
+          android-arch: arm64
+          android-triple: aarch64-linux-android
+          ndk-version: 29.0.14206865
+          runner: ubuntu-latest
+
+        - android-abi: armeabi-v7a
+          android-arch: arm
+          android-triple: arm-linux-androideabi
+          ndk-version: 29.0.14206865
+          runner: ubuntu-latest
+
+        - android-abi: x86_64
+          android-arch: x86_64
+          android-triple: x86_64-linux-android
+          ndk-version: 29.0.14206865
+          runner: ubuntu-latest
+
+        - android-abi: x86
+          android-arch: x86
+          android-triple: i686-linux-android
+          ndk-version: 29.0.14206865
+          runner: ubuntu-latest
+
+    runs-on: ${{ matrix.runner }}
+    steps:
+    - uses: actions/checkout@v5
+
+    - name: Setup Android SDK
+      uses: android-actions/setup-android@v3
+      with:
+        packages: 'tools platform-tools platforms;android-21 ndk;${{ matrix.ndk-version }}'
+
+    - name: Set up Android NDK
+      run: |
+        echo "ANDROID_NDK_ROOT=$ANDROID_SDK_ROOT/ndk/${{ matrix.ndk-version }}" >> $GITHUB_ENV
+
+    - uses: actions/setup-python@v6
+      with:
+        python-version: '3.13'
+
+    - name: Restore Python build cache
+      id: cache-android-python-restore
+      uses: actions/cache/restore@v4
+      with:
+        path: ~/python-prefix
+        key: cache-android-python-3.13.9-${{ matrix.android-abi }}-ndk${{ matrix.ndk-version }}
+
+    - name: Build Python 3.13
+      if: steps.cache-android-python-restore.outputs.cache-hit != 'true'
+      run: |
+        wget https://www.python.org/ftp/python/3.13.9/Python-3.13.9.tar.xz
+        tar -xJf Python-3.13.9.tar.xz
+        sed -i.bak "s/aarch64-linux-android/${{ matrix.android-triple }}/" Python-3.13.9/Android/android.py
+        sed -i.bak "s/ndk_version=[0-9.]\{1,\}/ndk_version=${{ matrix.ndk-version }}/" Python-3.13.9/Android/android-env.sh
+        (cd Python-3.13.9/Android && python3 android.py build ${{ matrix.android-triple }})
+        cp -R Python-3.13.9/cross-build/${{ matrix.android-triple }}/prefix ~/python-prefix
+        rm -rf Python-3.13.9
+
+    - name: Save Python build cache
+      id: cache-android-python-save
+      if: steps.cache-android-python-restore.outputs.cache-hit != 'true'
+      uses: actions/cache/save@v4
+      with:
+        path: ~/python-prefix
+        key: ${{ steps.cache-android-python-restore.outputs.cache-primary-key }}
+
+    - name: Restore thirdparty build cache
+      id: cache-android-thirdparty-restore
+      uses: actions/cache/restore@v4
+      with:
+        path: ./thirdparty
+        key: cache-android-thirdparty-afc7ad98aee90da0f2f6bad826a41f9b71e0cdd0-${{ matrix.android-abi }}-ndk${{ matrix.ndk-version }}
+
+    - name: Install yasm
+      if: steps.cache-android-thirdparty-restore.outputs.cache-hit != 'true'
+      run: ${{runner.os == 'macOS' && 'brew' || 'sudo apt-get'}} install yasm
+
+    - name: Build thirdparty packages
+      if: steps.cache-android-thirdparty-restore.outputs.cache-hit != 'true'
+      run: |
+        git clone --revision=afc7ad98aee90da0f2f6bad826a41f9b71e0cdd0 --depth=1 https://github.com/rdb/panda3d-thirdparty.git thirdparty
+        cd thirdparty
+        cmake -B build \
+          -DCMAKE_BUILD_TYPE=Release \
+          -DCMAKE_TOOLCHAIN_FILE=$ANDROID_NDK_ROOT/build/cmake/android.toolchain.cmake \
+          -DCMAKE_ANDROID_ARCH_ABI=${{ matrix.android-abi }} \
+          -DCMAKE_ANDROID_ARCH=${{ matrix.android-arch }} \
+          -DCMAKE_SYSTEM_VERSION=21 \
+          -DANDROID_ABI=${{ matrix.android-abi }} \
+          -DANDROID_PLATFORM=android-21 \
+          -DBUILD_FCOLLADA=OFF \
+          -DBUILD_OPENSSL=OFF \
+          -DBUILD_VRPN=OFF \
+          -DBUILD_ARTOOLKIT=OFF
+        cmake --build build --config Release -j4
+        rm -rf build
+
+    - name: Save thirdparty build cache
+      id: cache-android-thirdparty-save
+      if: steps.cache-android-thirdparty-restore.outputs.cache-hit != 'true'
+      uses: actions/cache/save@v4
+      with:
+        path: ./thirdparty
+        key: ${{ steps.cache-android-thirdparty-restore.outputs.cache-primary-key }}
+
+    - name: Build for Android
+      shell: bash
+      run: |
+        python makepanda/makepanda.py --git-commit=${{github.sha}} --target android-21 --python-incdir=~/python-prefix/include --python-libdir=~/python-prefix/lib --arch ${{ matrix.android-arch }} --everything --no-openssl --no-tinydisplay --no-pandatool --verbose --threads=4
+
+    - name: Install test dependencies
+      shell: bash
+      run: |
+        python -m pip install -t ~/python-prefix/lib/python3.13/site-packages -r requirements-test.txt
+
+    - name: Enable KVM group perms
+      if: startsWith(matrix.runner, 'ubuntu')
+      run: |
+          echo 'KERNEL=="kvm", GROUP="kvm", MODE="0666", OPTIONS+="static_node=kvm"' | sudo tee /etc/udev/rules.d/99-kvm4all.rules
+          sudo udevadm control --reload-rules
+          sudo udevadm trigger --name-match=kvm
+
+    - name: Setup Android Emulator and Run Tests
+      if: startsWith(matrix.android-abi, 'x86')
+      uses: reactivecircus/android-emulator-runner@v2
+      with:
+        api-level: 27
+        arch: ${{ matrix.android-abi }}
+        target: default
+        profile: pixel_6
+        script: |
+          adb shell "rm -rf /data/local/tmp/panda3d-tests"
+          adb push built/bin/run_tests /data/local/tmp/panda3d-tests/run_tests
+          adb shell "mkdir /data/local/tmp/panda3d-tests/lib"
+          adb push built/lib/*.so /data/local/tmp/panda3d-tests/lib
+          adb push ~/python-prefix/lib/*.so /data/local/tmp/panda3d-tests/lib
+          adb push ~/python-prefix/lib/python3.13 /data/local/tmp/panda3d-tests/lib/python3.13
+          adb push built/panda3d /data/local/tmp/panda3d-tests/lib/python3.13/site-packages/
+          adb push built/direct /data/local/tmp/panda3d-tests/lib/python3.13/site-packages/
+          adb push built/models /data/local/tmp/panda3d-tests/models
+          adb push built/etc /data/local/tmp/panda3d-tests/etc
+          adb push tests /data/local/tmp/panda3d-tests/tests
+          adb shell "cd /data/local/tmp/panda3d-tests && LD_LIBRARY_PATH=/data/local/tmp/panda3d-tests/lib PYTHONPATH=/data/local/tmp/panda3d-tests/lib/python3.13/site-packages ./run_tests -v tests"