ccache for building

**Describe the problem you have/What new integration you would like**

The builds are slow and even for copy-and-pasted configuration take a long time. Using ccache for the builds would require only single compilation for most of the code (since the node name is built-in, there still would be one compilation and linking, but that's already way shorter than full build for every new device).

**Please describe your use case for this integration and alternatives you've tried:**

It's just to spend less time waiting for the firmware builds.

**Additional context**

None.