Optimize Github Actions workflows

[leventozen]

We are using npm ci to install all the dependencies. It uses only package lock file, so npm can skip the first steps (you can find more detailed information here). It does clean install, in other words deletes node_modules. However, we can cache ~/.npm to prevent redownloading all this stuff.

[muratcorlu]

@leventozen can we consider this done with #152 ?