A `justfile` for running tasks locally?

[RobertJacobsonCDC]

Do we want a justfile to run tasks in the local dev environment? Just is a command / task runner similar in spirit to make but without the historical baggage or complexity of a build-system. "Tasks" are defined with "recipes", and tasks are composable. A justfile for ixa could contain:

• one-time environment setup tasks like installing MDBook, pro-commit, wasm-pack, etc.
• granular build tasks for wasm, examples, etc., and a "build everything" task
• a test task that serves as a single source of truth for what should be tested
• a task to run ALL examples correctly (see Some cargo build/test tasks are not running in CI #458)
• clean-target (i.e. cargo clean), clean-docs, clean-book, clean-wasm, clean-outputs (report outputs of examples)
• a ci task that runs everything that runs in CI but locally (single source of truth)

I have an example implementation in #460.

[RobertJacobsonCDC]

Here's an example of integrating just with pre-commit.