Just a general tip: don't use your distro version of rust (Lemmy) and nodejs (lemmy-UI). Instead, install them using a version manager, which allows you to switch to different versions of rust or nodejs without being tied to whatever version your distro have in their repository. This is very useful during development when you often need to try different versions to debug an issue (e.g. is this bug only happen on certain compiler version?), testing an upcoming beta features, etc. This apply to most programming languages as well, such as Python, PHP, Go, etc.
For rust, rustup seems to be a popular choice. For nodejs, nvm and asdf is quite popular. asdf even support both rust and nodejs.