Merge branch 'bump-ci' into 'master'

.gitlab-ci-local/.gitignore

.gitlab-ci.yml

Makefile

apps/FibChildStealing.cpp

apps/MatMul.cpp

docker.sh

emper/Common.cpp

emper/ContextManager.cpp

emper/Continuation.hpp

emper/Emper.cpp

emper/Emper.hpp

emper/Fiber.cpp

emper/Fiber.hpp

emper/Fibril.hpp

emper/Runtime.cpp

emper/Runtime.hpp

emper/Scheduler.cpp

emper/Scheduler.hpp

emper/SynchronizedFiber.hpp

emper/io.hpp