Add prepare script to allow CI to skip build

[thornbill]

Changes

• Adds a prepare script that allows the build on install to be skipped by setting a SKIP_PREPARE environment variable
• Removes condition that skips install if cache is hit

Issues
🤞 hopefully the recent CI build failures

[thornbill]

Current approach:

Skips yarn install if node_modules exists. This seems to be having issues where node_modules exists but not all dependencies are available for some reason which causes CI failures.

This approach:

Always runs yarn install which should be very fast ~1s when all packages are current. But we have a prepare script defined to run a production build on install this is required to support installing an npm package from a git repository. In order to avoid calling the build during the prepare step, I added a small bash script that checks if a SKIP_PREPARE environment variable has been set.

Alternatives:

• Include the --ignore-scripts parameter when calling yarn install
  • Cons: May cause random breakages when a dependency needs to run a script during build (Make yarn install --ignore-scripts more specific yarnpkg/yarn#7338)
• Remove the prepare script entirely
  • Cons: Breaks the ability to install jellyfin-web via the git repository as a dependency in a separate project. Maybe this doesn't matter though since we are moving away from bundled clients?

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!

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4.2% Duplication