💥

.github/workflows/test.yml

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+name: Test
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  test:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, ubuntu-24.04-arm]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Copilot CLI
+        uses: ./
+        with:
+          version: latest
+
+      - name: Verify copilot is on PATH
+        run: which copilot
+
+      - name: Check version
+        run: copilot --version

LICENSE

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+MIT License
+
+Copyright (c) 2026 GitHub
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# setup-copilot
+
+A GitHub Action to install the [GitHub Copilot CLI](https://github.com/github/copilot-cli) in your workflow.
+
+## Usage
+
+```yaml
+steps:
+  - uses: actions/setup-copilot@v1
+    with:
+      version: "latest" # optional, defaults to "latest"
+      github-token: ${{ secrets.COPILOT_TOKEN }} # optional, defaults to github.token
+  - run: copilot --version
+```
+
+## Inputs
+
+| Input          | Description                                       | Required | Default          |
+| -------------- | ------------------------------------------------- | -------- | ---------------- |
+| `version`      | Version to install (`latest`, `prerelease`, or a specific version like `1.0.0`) | No | `latest` |
+| `github-token` | GitHub token for Copilot authentication           | No       | `github.token`   |
+
+## Outputs
+
+| Output    | Description                            |
+| --------- | -------------------------------------- |
+| `version` | The version of Copilot CLI installed   |
+
+## Examples
+
+### Install latest version
+
+```yaml
+- uses: actions/setup-copilot@v1
+```
+
+### Install a specific version
+
+```yaml
+- uses: actions/setup-copilot@v1
+  with:
+    version: "1.2.3"
+```
+
+### Use with a custom token
+
+```yaml
+- uses: actions/setup-copilot@v1
+  with:
+    github-token: ${{ secrets.COPILOT_TOKEN }}
+```
+
+## How it works
+
+This action uses the [official Copilot CLI install script](https://gh.io/copilot-install) to download and install the binary, with checksum verification. The binary is installed to the runner's tool cache and added to `PATH`.
+
+## License
+
+[MIT](LICENSE)

action.yml

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+name: "Setup Copilot CLI"
+description: "Install the GitHub Copilot CLI for use in GitHub Actions workflows"
+branding:
+  icon: "terminal"
+  color: "blue"
+
+inputs:
+  version:
+    description: "Version of Copilot CLI to install (e.g. '1.0.0', 'latest', 'prerelease')"
+    required: false
+    default: "latest"
+  github-token:
+    description: "GitHub token for Copilot authentication. Defaults to the workflow token."
+    required: false
+    default: ${{ github.token }}
+
+outputs:
+  version:
+    description: "The version of Copilot CLI that was installed"
+    value: ${{ steps.version.outputs.version }}
+
+runs:
+  using: "composite"
+  steps:
+    - name: Install Copilot CLI
+      shell: bash
+      env:
+        VERSION: ${{ inputs.version }}
+        PREFIX: ${{ runner.tool_cache }}/copilot
+      run: curl -fsSL https://gh.io/copilot-install | bash
+
+    - name: Add to PATH
+      shell: bash
+      run: echo "${{ runner.tool_cache }}/copilot/bin" >> "$GITHUB_PATH"
+
+    - name: Set GITHUB_TOKEN
+      shell: bash
+      env:
+        GH_TOKEN: ${{ inputs.github-token }}
+      run: echo "GITHUB_TOKEN=${GH_TOKEN}" >> "$GITHUB_ENV"
+
+    - name: Verify installation
+      id: version
+      shell: bash
+      run: |
+        copilot --version
+        echo "version=$(copilot --version | head -1)" >> "$GITHUB_OUTPUT"