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Automation is a really important point to build reliable software. There are many tools available to do the job, and most of them are open-source.
The first tool to consider is the one that will automatically call every other ones for every modification of your source code. It is really important to have a software to do that and there are several reasons for that:
The standard steps you should do on the continuous integration tool:
Sometimes, you will build a better development chain on an old source code base with many quality defects. In this case, it is often not possible to fix all quality issues before applying the new development chain. The good approach in this case is to consider the actual quality level as the reference, the target being to do always better but never worse.
Let's take the example of compilation warnings. Consider you have 1024 compilation warnings in the software:
Communicate this rule to your developers, and you will see the number of warnings decrease until reaching O. It can take several weeks or several month, depending of your software.