Prevent GitHub-hosted runner updates from breaking workflows by cleaning up pre-installed bloat (15-20 GiB freed). ## Changes - Added `lengau/pristine-ubuntu-action@v0` as first step in `setup-python-runner/action.yaml` - Conditionally runs only on GitHub-hosted Linux runners: `runner.os == 'Linux' && runner.environment == 'github-hosted'` - Self-hosted runners automatically skip this step ## Affected Workflows Applies to all workflows using `setup-python-runner`: - `test-python.yaml` (reusable workflow) - `self-test-setup.yaml` - Any downstream callers ```yaml steps: - name: Pristine Ubuntu if: ${{ runner.os == 'Linux' && runner.environment == 'github-hosted' }} uses: lengau/pristine-ubuntu-action@v0 - name: Start apt update # ... rest of setup ``` > [!WARNING] > > <details> > <summary>Firewall rules blocked me from connecting to one or more addresses (expand for details)</summary> > > #### I tried to connect to the following addresses, but was blocked by firewall rules: > > - `https://api.github.com/repos/lengau/pristine-ubuntu-action` > - Triggering command: `/usr/bin/curl curl -s REDACTED` (http block) > - `https://api.github.com/repos/lengau/pristine-ubuntu-action/tags` > - Triggering command: `/usr/bin/curl curl -s REDACTED` (http block) > > If you need me to access, download, or install something from one of these locations, you can either: > > - Configure [Actions setup steps](https://gh.io/copilot/actions-setup-steps) to set up my environment, which run before the firewall is enabled > - Add the appropriate URLs or hosts to the custom allowlist in this repository's [Copilot coding agent settings](https://github.com/canonical/starflow/settings/copilot/coding_agent) (admins only) > > </details> <!-- START COPILOT ORIGINAL PROMPT --> <details> <summary>Original prompt</summary> > > ---- > > *This section details on the original issue you should resolve* > > <issue_title>Use the pristine-ubuntu action on hosted runners</issue_title> > <issue_description>### What needs to get done > > On hosted runners we should use a version of https://github.com/lengau/pristine-ubuntu-action/. > > ### Why it needs to get done > > Prevent updated runners from breaking us yet again. </issue_description> > > <agent_instructions>That action should be the first thing that's run on the github-hosted runners. It should not run on self-hosted runners at all.</agent_instructions> > > ## Comments on the Issue (you are @copilot in this section) > > <comments> > </comments> > </details> <!-- START COPILOT CODING AGENT SUFFIX --> - Fixes canonical/starflow#100 <!-- START COPILOT CODING AGENT TIPS --> --- 💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more [Copilot coding agent tips](https://gh.io/copilot-coding-agent-tips) in the docs.