Add rzup installation script

[hmrtn]

This introduces two shell scripts for easy installation and version management of the r0 toolchain with rzup.

To install rzup, download and execute the install script with this one-liner:

curl -L https://risc0-artifacts.s3.us-west-2.amazonaws.com/rzup/install | bash

This automates the installation by downloading the rzup and adding it to the user's PATH.

Once installed, use rzup:

rzup

Running rzup automates the installation of cargo-binstall, cargo-risczero, and the toolchain, making it very easy for users get started.

We should consider setting up a redirect to a more user-friendly URL, such as:

curl -L r0.xyz/install | bash

Prior to merging, we should edit the url paths to main, rather than the installer branch.
https://github.com/risc0/risc0/blob/hmrtn/rzup-installer/rzup/install#L14
https://github.com/risc0/risc0/blob/hmrtn/rzup-installer/rzup/README.md?plain=1#L9

I have tested this on MacOS and Linux. It would be great to have a windows user test it.

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[austinabell]

Small note that this will build cargo-binstall from scratch if you have an older version, but this shouldn't be necessary to have the most up to date version. Feel free to ignore this comment, just figure I'd mention!

[flaub]

Would it be possible to test this in CI?

[flaub]

I should note that windows isn't a supported platform right now (unless you consider WSL/WSL2, but that's not really windows).

[hmrtn]

Would it be possible to test this in CI?

I am not very familiar with our CI workflow, but messing around locally with a new job in similar fashion to the others, I think it is possible.

My local workflow testing with the act tool fails, but something like this is probably what we want:

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index ebdc9e20..988984dd 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml

@@ -38,6 +38,7 @@ jobs:
       examples: ${{ steps.filter.outputs.examples }}
       test: ${{ steps.filter.outputs.test }}
       web: ${{ steps.filter.outputs.web }}
+      rzup: ${{ steps.filter.outputs.rzup }}
     steps:
       - uses: actions/checkout@v4
       - uses: risc0/paths-filter@de90cc6fb38fc0963ad72b210f1f284cd68cea36
@@ -83,6 +84,9 @@ jobs:
               - examples/browser-verify/**
               - risc0/**
               - xtask/**
+            rzup:
+              - *base
+              - rzup/**

   # see: https://github.com/orgs/community/discussions/26822
   main-status-check:
@@ -431,3 +435,28 @@ jobs:
         env:
           RISC0_USE_DOCKER: "1"
       - run: sccache --show-stats
+
+  rzup:
+    if: needs.changes.outputs.rzup == 'true'
+    needs: changes
+    runs-on: [self-hosted, prod, "${{ matrix.os }}", cpu]
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [Linux, macOS]
+    steps:
+      - uses: actions/checkout@v4
+      - uses: ./.github/actions/rustup
+      - uses: ./.github/actions/sccache
+        with:
+          key: ${{ matrix.os }}-default
+      - name: Install rzup
+        run: |
+          chmod +x rzup/install
+          rzup/install
+          source ~/.bashrc
+      - name: Run rzup
+        run: |
+          chmod +x rzup/rzup
+          rzup/rzup --verbose
+      - run: sccache --show-stats