Fix signing apk issue in deploy_release.yml

see r0adkll/sign-android-release#84

.github/workflows/deploy_release.yml

@@ -46,6 +46,13 @@ jobs:
       - name: Build APK
         run: bash ./gradlew assembleRelease --stacktrace -Dversion.code=${{ steps.get_vcode.outputs.VCODE }}
 
+      - name: Setup build tool version variable
+        shell: bash
+        run: |
+          BUILD_TOOL_VERSION=$(ls /usr/local/lib/android/sdk/build-tools/ | tail -n 1)
+          echo "BUILD_TOOL_VERSION=$BUILD_TOOL_VERSION" >> $GITHUB_ENV
+          echo Last build tool version is: $BUILD_TOOL_VERSION
+
       - uses: r0adkll/sign-android-release@v1
         name: Sign app APK
         id: sign_app_apk
@@ -56,7 +63,7 @@ jobs:
           keyStorePassword: ${{ secrets.KEY_STORE_PASSWORD }}
           keyPassword: ${{ secrets.KEY_PASSWORD }}
         env:
-          BUILD_TOOLS_VERSION: "30.0.2"
+          BUILD_TOOLS_VERSION: ${{ env.BUILD_TOOL_VERSION }}
 
       - name: Upload APK Release Asset
         id: upload-release-asset-apk