Did you find a suspicious "pcsx4" repository on GitHub? Report it to GitHub Trust & Safety. Have questions about legitimate emulation? Visit the Emulation General Wiki or the /r/emulation subreddit.
While there are GitHub repositories using the name "PCSX4," they do not contain functional emulation code for the PS4. One such repository, PS4-Emu-Dev/DEngine-pcsx4 pcsx4 github link
There is no official pcsx4 repository with active code that can boot a commercial PS4 game. Did you find a suspicious "pcsx4" repository on GitHub
To get started with PCSX4, you'll need to download the emulator from the official GitHub repository. Here's the PCSX4 GitHub link: pcsx4 github link