Google releases new API SDKs quite rarely (about 2 times a year), but when
they do this, many apps quickly start using it. Allow downloading new API
SDKs to avoid waiting for the next buildserver rebuild.
chmod g+w $ANDROID_HOME
find $ANDROID_HOME/ -type f -executable -print0 | xargs -0 chmod a+x
-# allow gradle to install newer build-tools versions
-chgrp vagrant $ANDROID_HOME/build-tools
-chmod g+w $ANDROID_HOME/build-tools
+# allow gradle to install newer build-tools and platforms
+chgrp vagrant $ANDROID_HOME/{build-tools,platforms}
+chmod g+w $ANDROID_HOME/{build-tools,platforms}
# allow gradle/sdkmanager to install into the new m2repository
test -d $ANDROID_HOME/extras/m2repository || mkdir -p $ANDROID_HOME/extras/m2repository