Added Android SDK bootstrap pipeline

.drone.yml

@@ -3,6 +3,19 @@ type: exec
 name: default
 
 steps:
+  - name: bootstrap
+    commands:
+      - wget https://dl.google.com/android/repository/commandlinetools-linux-8092744_latest.zip
+      - mkdir -p Android/Sdk/cmdline-tools/latest
+      - unzip commandlinetools-linux-8092744_latest.zip
+      - mv cmdline-tools/* Android/Sdk/cmdline-tools/latest
+
+  - name: fetch
+    commands:
+      - yes | Android/Sdk/latest/cmdline-tools/bin/sdkmanager --licenses
+      - Android/Sdk/latest/cmdline-tools/bin/sdkmanager --install "build-tools;32.0.0"
+      - Android/Sdk/latest/cmdline-tools/bin/sdkmanager --install "platforms;android-32"
+
   - name: build
     commands:
       - flutter pub get