Dockerfile to generate vlc.js builds

Hi Team,

As the title suggests, I want to add a Dockerfile and improve build steps/instructions for vlc.js

• This will streamline the build process.
• This can be leveraged in CI/CD processes for generating vlc.js artifacts.
• Consistent Environment for building artifacts.

I want to take this up for my GSoC'23 proposal, so please let me know your feedback.

Best Regards,

Rahul