ci: add GitHub Actions workflow to build Android APK on Ubuntu

Builds APK using buildozer on Ubuntu 22.04 (Linux) to avoid
macOS-specific SDL2_image cross-compilation issue where libSDL2_image.so
cannot load PNG files on Android.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: samvelkoch

.github/workflows/build-apk.yml

@@ -0,0 +1,60 @@
+name: Build Android APK
+
+on:
+  push:
+    branches: [ feature/material-design ]
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-22.04
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.11'
+
+      - name: Install system dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y \
+            git zip unzip openjdk-17-jdk \
+            autoconf libtool pkg-config \
+            zlib1g-dev libncurses5-dev libncursesw5-dev \
+            cmake libffi-dev libssl-dev \
+            python3-pip
+
+      - name: Install buildozer and dependencies
+        run: |
+          pip install buildozer cython
+
+      - name: Cache buildozer global dir
+        uses: actions/cache@v4
+        with:
+          path: ~/.buildozer
+          key: buildozer-${{ hashFiles('android_app/buildozer.spec') }}
+          restore-keys: |
+            buildozer-
+
+      - name: Build APK
+        working-directory: android_app
+        run: |
+          buildozer android debug 2>&1 | tee build.log
+
+      - name: Upload APK
+        uses: actions/upload-artifact@v4
+        with:
+          name: dungeonblackcastle-debug-apk
+          path: android_app/bin/*.apk
+          retention-days: 7
+
+      - name: Upload build log (on failure)
+        if: failure()
+        uses: actions/upload-artifact@v4
+        with:
+          name: build-log
+          path: android_app/build.log

android_app/buildozer.spec

@@ -1,17 +1,18 @@
 [app]
-title       = Подземелья Чёрного замка
-package.name    = dungeonblackcastle
+title       = Подземелья Чёрного замка (MD)
+package.name    = dungeonblackcastlemd
 package.domain  = org.braslavsky
 
 source.dir      = .
+source.main     = main_md.py
 source.include_exts = py,json,ttf,png
 source.include_patterns = assets/*,icons/*,sections.json,TwemojiMozilla.ttf,ArialUnicode.ttf
 
-version = 1.0
+version = 2.0
 
+# kivymd уже присутствует в requirements
 requirements = python3,kivy==2.3.0,kivymd,pyjnius==1.6.1
 
-
 # Иконка (добавь файл icon.png 512x512 в android_app/)
 # icon.filename = %(source.dir)s/icon.png
 # presplash.filename = %(source.dir)s/presplash.png
@@ -25,14 +26,10 @@ android.minapi      = 24
 android.ndk         = 25b
 android.archs       = arm64-v8a, armeabi-v7a
 
-# Разрешить установку из неизвестных источников не нужно — это сторона пользователя
 android.allow_backup = True
 
-# Логи при отладке
 log_level = 2
 
 [buildozer]
-# Директория для кэша buildozer (SDK, NDK, etc.)
-# Занимает ~4 GB — убедитесь что места достаточно
 build_dir = ./.buildozer
 bin_dir   = ./bin