DevOps: automated Build & Deploy process required

[shaunanoordin]

DevOps Issue

The Subject Assistant repo current relies on a manual build process (npm run build). This build (changes to the code in /app) then needs to be committed/merged, before the code is automatically deployed to Github Pages.

We need to change this to an automated process to keep it in line with our other frontend repos.

Without an automated build, it's very easy to forget to run the manual build process, and Dependabot updates in particular don't get deployed.

[eatyourgreens]

Here's a workflow that installs dependencies, runs a build then deploys to GH Pages.
https://github.com/zooniverse/iiif-annotations/blob/main/.github/workflows/push_build.yml