Reduce runtime of optimize-image script #456

Closes #441.

Changed optimize-images script to keep track of all the images it has already optimized (through a hash) in a already-optimized-images.json file.
Removed the public/images folder from gitignore so that optimized images will be tracked.
Added better logging for the script
Fixed issue with script ignoring images that end with ".JPG" (uppercase)

If reviewers want, I can try to revert the images commit so the number of files changed is reduced, however, I don't think its that bad, if you scroll down all the way once and click the "show more" button one time its pretty easy to get to the changed code files.

Usage:

Now, the ideal case is everytime someone adds a new image, they should run npm run build:images locally, and commit that.

However, if they forgot, that is fine, however, after a while if many images build up and we notice the build time going up again, someone should run npm run build:images and commit that to cache the optimized images.

staging: https://csclub.uwaterloo.ca/~a3thakra/csc/shahanneda/optimze-image-script/about/team/

in the future, we should consider properly storing images in a cdn

The problem with checking in the public/images folder is that nothing is stopping anyone to add on to that folder.

It would be much better if we could:

restore public/images artifact from a previous CI run before optimizing images
run this optimize images script
create a new public/images artifact and to overwrite the previous one

This was we are never storing 2x the images in our repo and it avoids all manual work while decreasing build times.

cc @r389li can we setup artifactory or something and add it to drone? https://plugins.drone.io/plugins/artifactory

@a3thakra we definitely don't need Artifactory. What we can do is put the images in /srv on Caffeine, and then just link to them using Apache URL rewrites. Let me know if you have other ideas.

 import { ImagePool } from "@squoosh/lib";
 import fse from "fs-extra";
 import { default as getImageDimensions } from "image-size";
 import SparkMD5 from "spark-md5";

Reduce runtime of optimize-image script #456

Reviewers