Automate playground compiler versions updates

[ryyppy]

Currently the playground fetches its compiler / react bundles from our CDN, but we need to manually adjust the CompilerManagerHook module whenever a new playground version has been released.

This is tedious. Ideally we want to automate the playground bundle generation process for each proper version release. The website should update itself whenever a new playground version has been uploaded.

Proposed Architecture:

Playground / rescript-lang.org changes

• Use getStaticProps to generate the available versions data on incremental builds / revalidations
• Within the getStaticProps logic, query https://cdn.rescript-lang.org/ and enumerate all vX.X.X versions
  • versions tagged as alpha or beta release should be separated in "experimental versions"
  • On initial load without version query param, the playground should load the latest official version
• Pass the information down to the playground page and introduce the data in the version select dropdown
• Introduce a protected revalidation route, as stated in the NextJS docs: https://nextjs.org/docs/basic-features/data-fetching/incremental-static-regeneration#using-on-demand-revalidation
• Introduce a secret for the revalidation logic and store it in the rescript-lang.org secrets

ReScript compiler repo changes:

• Store the revalidation key as a secret in the rescript-compiler repo
• In the playground/update_bundle.sh script, run the revalidation url with the stored secret after the newest bundle has been uploaded

[aspeddro]

On initial load without version query param, the playground should load the latest official version

I'm working on it and I'm making a call to https://registry.npmjs.org/rescript/latest to get the latest stable version and load the compiler, but the CDN doesn't have the "10.1.4" version. https://cdn.rescript-lang.org/

Should we update the CDN or is there another way to do this?

[ryyppy]

There is no equivalent 10.1.4 release, since we didn't have the chance to generate a JS bundle and it's too much work to backport the necessary infrastructure support.

[ryyppy]

By "latest official version", I actually meant the latest version that is acailable on the CDN that is not an alpha / beta version.

[fhammerschmidt]

This worked flawlessly when ReScript 11 was published. Closing...