[FIX] Clone and Push

[catks]

• Change Dockerfile and entrypoint to use git-http-server instead of nginx, also fixing the node and alpine version.

• Fix README.md with the correct file path to add repositories in /var/lib/initial

• test.sh refactoring and new test for git push

• [TECH] Tests in docker-compose

  • Move the tests to run in the a docker container
  • Adds wait-for-it.sh to wait gitserver before tests
  • Replaces cirocosta/gitserver-http to catks/gitserver-http
  • Change README.md

• [TECH] Adds Github Actions CI

  • Adds build and test to the new ci
  • Remove travis
  • Adds tini to better handle exiting