fix: add android platform before sync

Dockerfile.android

@@ -38,7 +38,7 @@ COPY package*.json ./
 RUN npm install
 
 COPY . .
-RUN npm run build && npx cap sync android
+RUN npm run build && npx cap add android && npx cap sync android
 
 WORKDIR /workspace/android
 RUN chmod +x gradlew

capacitor.config.json

@@ -7,7 +7,12 @@
   },
   "android": {
     "backgroundColor": "#ffffff",
-    "allowMixedContent": true
+    "allowMixedContent": true,
+    "icon": "public/icons/icon.png",
+    "adaptiveIcon": {
+      "foreground": "public/icons/ic_launcher_foreground.png",
+      "background": "public/icons/ic_launcher_background.png"
+    }
   },
   "plugins": {
     "SplashScreen": {