[Feature] CI: Include rzup in workflow

[hmrtn]

Feature

We should introduce CI tests for the recently added rzup installation scripts (#1774).

Motivation

To test the installation process works as intended via rzup when changes occur to the scripts, or general install procedure.

Implementation

There is a reference comment for adding a new job to the main workflow here: #1774 (comment)

@morgangibbs87 alternatively pointed out these CI tests can be included in the nightly workflow, or in the scripts workflow with something like this block:

- name: Install rzup
  env:
    GITHUB_SHA: ${{ github.sha }}
  run: bash ./install
  working-directory: ./rzup

- name: Installs RISC Zero and Toolchain
  env:
    GITHUB_SHA: ${{ github.sha }}
  run: bash ./rzup
  working-directory: ./rzup

[linear]

ZKVM-423 [Feature] CI: Include `rzup` in workflow

[morgangibbs87]

Forgot to add shell to the sample CI I gave. Without it you might get an error.

Corrected:

- name: Install rzup
  env:
    GITHUB_SHA: ${{ github.sha }}
  run: bash ./install
  shell: bash
  working-directory: ./rzup

- name: Installs RISC Zero and Toolchain
  env:
    GITHUB_SHA: ${{ github.sha }}
  run: bash ./rzup
  shell: bash
  working-directory: ./rzup