feat: rewrite app system

Makefile

@@ -18,6 +18,8 @@ ANDROID_KEYSTORE_KEY_VALIDITY ?= 365000
 
 ANDROID_BUILD_TOOLS_VERSION ?= 34.0.0
 
+APPS := main
+
 watch: tools/modd/bin/modd deps ## Watching updated files - live reload
 	( set -o allexport && source .env && set +o allexport && tools/modd/bin/modd )
 
@@ -27,7 +29,12 @@ test: test-go ## Executing tests
 test-go: deps
 	( set -o allexport && source .env && set +o allexport && go test -v -count=1 $(GOTEST_ARGS) ./... )
 
-build: build-desktop build-android build-client ## Build artefacts
+build: build-apps build-desktop build-android build-client ## Build artefacts
+
+build-apps: $(foreach name,$(APPS),build-app-$(name))
+
+build-app-%:
+	$(MAKE) -C apps/$* build
 
 build-desktop: deps ## Build executable
 	CGO_ENABLED=0 GOARCH=$(GOARCH) go build \
@@ -69,7 +76,7 @@ release-android: $(ANDROID_KEYSTORE_FILE) tools/gogio/bin/gogio deps ## Build ex
 		--in android/app/build/outputs/apk/release/app-release-unsigned-aligned.apk \
 		--out android/app/build/outputs/apk/release/app-release.apk
 
-install-android: build-android
+install-android: build-apps build-android
 	adb uninstall com.cadoles.arcast_player
 	adb install android/app/build/outputs/apk/debug/app-debug.apk
 	$(MAKE) run-android