Change run condition for masterJobLinux

The previous condition skipped the job when there were changes in .gitignore, .gitlab-ci.yml or README.md. The result was that sometimes important changes in src were not deployed to the nexus, when they were accompanied by changes in one of these three files. This was probably not the intended behaviour, so now the job is skipped only when there are no changes in src, pom.xml or settings.xml. It is also possible to run the job manually through the web interface via the "Run Pipeline" Button.

@kusmenko Please run the pipeline once manually, to deploy the current version (0.4.13-SNAPSHOT) to the nexus.