fix: cache sdk

.gitea/workflows/build.yml

@@ -32,6 +32,12 @@ jobs:
           export ANDROID_SDK_ROOT=$HOME/Android/Sdk
           export PATH=$PATH:$HOME/Android/Sdk/cmdline-tools/latest/bin
           sdkmanager "platform-tools" "platforms;android-30" "build-tools;30.0.3"
+      - uses: actions/cache@v3
+        with:
+          path: |
+            /root/Android/Sdk
+          key: ${{ runner.os }}-sdk-
+          restore-keys: ${{ runner.os }}-sdk-
 
       - name: Set up Android environment variables
         run: |