Replace manual apt-get install steps with declarative addons.apt.packages for gcc-multilib, and set sudo: false to enable container-based builds for faster CI execution.
Add before_install step to .travis.yml that updates apt packages and installs
gcc-multilib, enabling 32-bit C library headers and runtime for cross-compilation
in the CI environment.
Add .travis.yml with gcc and clang compilers running make && make test.
Modify script/test.py to call sys.exit(1) when any tests fail, ensuring
CI build correctly reports failure status.
