feat: add initial version of github action (#11)

.github/workflows/ci.yml

@@ -0,0 +1,39 @@
+name: CI
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+  schedule: 
+   - cron: "40 2 * * *"  # Run 40 mins after nightly noir release (which happens at 2 AM UTC)
+
+permissions:
+  contents: read
+
+jobs:
+  install:
+    name: Noir ${{matrix.toolchain}} on ${{matrix.os == 'ubuntu' && 'Linux' || matrix.os == 'macos' && 'macOS' || matrix.os == 'windows' && 'Windows' || '???'}}
+    runs-on: ${{matrix.os}}-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu, macos]
+        toolchain: [stable, nightly, 0.1.0, 0.1.1, 0.2.0, 0.3.0]
+    timeout-minutes: 45
+    steps:
+      - uses: actions/checkout@v3
+      - uses: ./
+        name: Run noir-lang/noirup
+        id: version
+        with:
+          toolchain: ${{matrix.toolchain}}
+      - run: nargo --version
+      - run: nargo new project
+      - run: nargo check
+        working-directory: ./project
+      - run: nargo compile test-circuit
+        working-directory: ./project
+      - run: nargo test
+        if: matrix.toolchain != '0.1.0'
+        working-directory: ./project
+

README.md

@@ -65,3 +65,52 @@ noirup --path ./git/noir
 **Tip**: All flags have a single character shorthand equivalent! You can use `-v` instead of `--version`, etc.
 
 ---
+
+## Github Action
+
+This action is in early development and so will likely experience breaking changes. It's recommended to pin to a particular tagged version.
+
+---
+
+Noirup is also available as a GitHub action to allow easy installation of the Noir toolchain using noirup.
+
+<br>
+
+## Example workflow
+
+```yaml
+name: test suite
+on: [push, pull_request]
+
+jobs:
+  test:
+    name: nargo test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: noir-lang/[email protected]
+        with:
+          version: 0.3.2
+      - run: nargo test
+```
+
+<br>
+
+## Inputs
+
+All inputs are optional.
+
+<table>
+<tr>
+  <th>Name</th>
+  <th>Description</th>
+</tr>
+<tr>
+  <td><code>version</code></td>
+  <td>
+    Noirup toolchain version e.g. <code>0.3.2</code>. Defaults to the latest stable release.
+  </td>
+</tr>
+</table>
+
+<br>

action.yml

@@ -0,0 +1,47 @@
+name: Noir Toolchain Install
+description: Install the Noir toolchain
+branding:
+  icon: activity
+  color: gray-dark
+
+inputs:
+  toolchain:
+    description: Noir version to install. Defaults to the latest stable version.
+    default: stable
+    required: false
+
+runs:
+  using: composite
+  steps:
+    - name: Check for unsupported OS (Windows)
+      if: runner.os == 'Windows'
+      shell: bash
+      run: echo "::error::Noirup Github action does not currently support Windows" && exit 1
+
+    - name: Parse toolchain
+      id: parse
+      run: |
+        : parse toolchain version
+        if [[ $toolchain == "stable" ]]; then
+          : By default, noirup installs the latest stable version
+        elif [[ $toolchain == "nightly" ]]; then
+          echo "toolchain="--nightly"" >> $GITHUB_OUTPUT
+        else
+          echo "toolchain="--version $toolchain"" >> $GITHUB_OUTPUT
+        fi
+      env:
+        toolchain: ${{inputs.toolchain}}
+      shell: bash
+
+    - name: Create `.nargo/bin` directory
+      shell: bash
+      run: |
+        mkdir -p $HOME/.nargo/bin
+        chmod +x $HOME/.nargo/bin
+        echo "${HOME}/.nargo/bin" >> $GITHUB_PATH
+
+    - name: Run Noirup
+      shell: bash
+      run:
+        ${{ github.action_path }}/noirup ${{steps.parse.outputs.toolchain}} 
+