Run type checks as a git hook? github action?

[rcantin-w]

We should run type checks at some point (PRs? builds?) to ensure we're in-line at all times. This came up because our mocks tend to get very out of date; an example is Prismic's Image type where they added two new required fields. Most mocks started showing errors, but as they're never interacted with, they're not getting updated.

We should add a type check, with a PR that fixes all flagged issues. Then, if/when it happens again, it has to be addressed right away and we're less in danger of falling behind.

Github action? https://github.com/marketplace/actions/typescript-compiler
Git hook? https://github.com/guardian/pressreader/blob/main/scripts/setup#L9