Adding first APK build

Makefile

@@ -14,7 +14,7 @@ ASSETS_DIR  := res/assets/ss_ee
 BUILD_DIR   := build
 ARCH        := $(shell uname -m)
 
-.PHONY: all dist build-image engine assets package clean
+.PHONY: all dist build-image engine assets package apk clean
 
 all: dist
 
@@ -107,8 +107,23 @@ package: engine
 	rm -rf "$(BUILD_DIR)/package"; \
 	echo "Wrote $(DIST_DIR)/$$PKG_NAME.tar.gz"
 
+# Builds the Quest APK (see build-image/build-apk.sh and
+# android/engine-patches/ - engine/ itself is never modified; a patch is
+# applied to a scratch copy at build time instead). Same
+# QUESTSHOCK_BUILD_IMAGE detection as `engine`. Unlike every other target
+# here, this needs network access at build time (Gradle/AGP's own
+# dependency resolution) - see build-image/Dockerfile.
+apk:
+	@if [ -n "$$QUESTSHOCK_BUILD_IMAGE" ]; then \
+		bash build-image/build-apk.sh; \
+	else \
+		./run-image.sh bash build-image/build-apk.sh; \
+	fi
+
 clean:
 	rm -rf "$(DIST_DIR)" "$(BUILD_DIR)" "$(ENGINE_OUT)" \
 		engine/build_ext engine/CMakeCache.txt engine/CMakeFiles \
 		engine/cmake_install.cmake engine/Makefile engine/systemshock \
-		engine/src/Libraries/CMakeFiles
+		engine/src/Libraries/CMakeFiles \
+		android/engine.properties android/app/src/main/assets android/app/src/main/jniLibs \
+		android/app/build android/.gradle android/app/.cxx