Added Dockerisation, CI job templates and CI jobs

.dockerignore

.env.example

.gitattributes

.gitignore

.gitlab-ci.yml

README.md

balance_tracker.yaml

ci/compose.yml

ci/compose/Dockerfile

ci/compose/entrypoint.sh

ci/config.ini

ci/dind/Dockerfile

ci/dind/entrypoint.sh

ci/node-replay.gitlab-ci.yml

ci/scripts/after-script.sh

ci/scripts/copy-datadir.sh

ci/scripts/copy-haf-config.sh

ci/scripts/prepare-stack-data-directory.sh

ci/scripts/replay-api-node.sh

ci/scripts/set-up-stack.sh