Add GitLab CI pipeline
This way we can run a build on every commit, and avoid breaking changes. This is based on the CI pipeline from the official ISEG OPC server: https://gitlab.cern.ch/jcop-opc-ua/iseg/iseg-opcua-server/
This way we can run a build on every commit, and avoid breaking changes. This is based on the CI pipeline from the official ISEG OPC server: https://gitlab.cern.ch/jcop-opc-ua/iseg/iseg-opcua-server/