If your goals are high-velocity software development and frequent delivery of working builds to production, you need to automate at least part of the testing and delivery process. Ideally, that means implementing CI/CD pipelines for your projects, along with test suites to catch errors before customers see the software, and scripts that implement the steps of the pipelines.
Continuous integration (CI) is a methodology for automating software builds, packaging, and tests in a consistent way. CI helps to give a team some confidence that changes they check into source code version control will not break the build or introduce bugs into the software. The endpoint of CI is typically a completed check-in to the main branch of a software repository.