Use newer Docker images in CI The new floor image contains GCC 5.5.0, like the old one. PiperOrigin-RevId: 402402465
Updates Linux docker image to use Bazel 4.1.0 and GCC 11.1 Updates Bazel dependencies Removes the last usage of the deprecated and removed Python2 PiperOrigin-RevId: 375759184
Generalize root directory in CI scripts PiperOrigin-RevId: 367628939
Add CI test scripts PiperOrigin-RevId: 360931988
