Add Dockerfile and GitLab-CI

.gitlab-ci.yml

+image: docker
+
+build:
+  stage: build
+  script:
+    - docker image build -t registry.git.rwth-aachen.de/acplt/rte-tools/rte-build-docker-image/image .
+    - docker push registry.git.rwth-aachen.de/acplt/rte-tools/rte-build-docker-image/image

Dockerfile

+FROM ubuntu:18.04
+
+RUN ln -fs /usr/share/zoneinfo/Europe/Berlin /etc/localtime && apt-get update -qq && apt-get install -y -qq build-essential bison flex tcl cmake gcc-arm-linux-gnueabihf gcc-mingw-w64-x86-64 binutils-mingw-w64-x86-64