Adjusting import map

[Angamanga]

This pull request makes the following changes:

• Hashing the names of the js-files in production-builds.
• Using keys from import-map to lazy-load modules in legacy-app
• Generating importmap for production-file-names when building the app

Testing checklist:

• [ ]

• I certify that I ran my checklist

Fixes ushahidi/platform# .

Ping @ushahidi/platform

[Angamanga]

@tuxpiper Ready for review!

[Angamanga]

@tuxpiper I somehow messed up something when building it looks like, I'll let you know when I have figured it out...

[tuxpiper]

Looks good to me! Note to self: need to work on the routine that copies the files to the CDN, so that it assigns /importmap.json non-caching HTTP headers.

[tuxpiper]

Looking even better now :) thinking to apply these headers to the different files:

  - include: [ index.html, config.js, config.json, manifest.json, importmap.json ]
    cache_control: "public, max-age=0, s-maxage=0, must-revalidate"
  - include: [ locales/* ]
    cache_control: "public, max-age=60, s-maxage=60, stale-while-revalidate=86400"
  - exclude: [ index.html, config.js, config.json, manifest.json, importmap.json, locales/* ]
    cache_control: "public, max-age=31536000, s-maxage=31536000"

I've added special rules for the locales files, which will allow them to be used for one full day, while still checking for changes in the background.

[tuxpiper]

Yes, still lgtm 👍

[Angamanga]

@Obadha2 Ready for QA. Another smoke test is needed, and could you also include some tests with the change of language? I did some changes there. 🙏