$ ./build.sh --quiet verify /home/travis/build.sh: line 59: ./build.sh: Permission denied. The command \"./build.sh --quiet verify\" exited with 126.
Looks like you need to check in the file build.sh with execution permissions. Please try the following from your own machine:
build.sh
git update-index --add --chmod=+x build.sh git commit -m 'Make build.sh executable' git push