A small-scale infrastructure for GitLab CI/CD

Continuous Integration and Continuous Delivery/Deployment (CI/CD) constitute a pillar of the present-day software development. Whether you need to compile, test, distribute your code, or simply automatically generate documentation, there is always a pipeline involved in one way or another. The IA2 group, in collaboration with other working groups at INAF, has started to build up a simple test infrastructure whose purpose, once in production, would be to guarantee an adequate processing power in order to support the execution of several simultaneous CI/CD jobs. This kind of approach could help a lot our developers and researchers.