Investigate mvnw and different gitlab-ci.yml configurations

Closes #130 (closed)

Goals:

• To create a more consistent build environment between dev and ci
• To update the gitlab-ci configuration and make it more readable where possible
  • Apply deploy stages only to release tags and develop branch (ensures no conflicts when releases are pushed to nexus)
• Revisit reporting from ci to try and get
  • Unit testing failures
  • Unit test code coverage
  • Code quality reporting