I specified the latest build-tools 30.0.1 for my Android project. Once I let it run it fails:
...
> Task :buildSrc:check
> Task :buildSrc:build
File /home/travis/.android/repositories.cfg could not be loaded.
Checking the license for package Android SDK Build-Tools 30.0.1 in /usr/local/android-sdk/licenses
Warning: License for package Android SDK Build-Tools 30.0.1 not accepted.
FAILURE: Build failed with an exception.
* What went wrong:
Could not determine the dependencies of task ':app:testCcc36c3DebugUnitTest'.
> Failed to install the following Android SDK packages as some licences have not been accepted.
build-tools;30.0.1 Android SDK Build-Tools 30.0.1
To build this project, accept the SDK license agreements and install the missing components using the Android Studio SDK Manager.
Alternatively, to transfer the license agreements from one workstation to another, see http://d.android.com/r/studio-ui/export-licenses.html
Using Android SDK: /usr/local/android-sdk
Here is the associated build. Can you please install the latest build-tools to the trusty instances?
* What went wrong:
Could not determine the dependencies of task ':app:compileReleaseJavaWithJavac'.
> Failed to install the following Android SDK packages as some licences have not been accepted.
build-tools;30.0.2 Android SDK Build-Tools 30.0.2
platforms;android-30 Android SDK Platform 30
To build this project, accept the SDK license agreements and install the missing components using the Android Studio SDK Manager.
Alternatively, to transfer the license agreements from one workstation to another, see http://d.android.com/r/studio-ui/export-licenses.html
Using Android SDK: /usr/local/android-sdk