Add actionlint workflow to lint GitHub Actions workflows

[Copilot]

Adds automated linting of workflow files using devops-actions/actionlint to catch common errors and security issues in GitHub Actions definitions.

Changes

• New workflow .github/workflows/actionlint.yml:
  • Triggers on push and pull_request scoped to .github/workflows/**
  • SHA-pinned to devops-actions/actionlint v0.1.11 — latest release
  • pull-requests: write permission included to enable inline PR annotations on changed files
  • Follows existing repo conventions: step-security/harden-runner, SHA-pinned actions

- name: Run actionlint
  uses: devops-actions/actionlint@469810fd82c015d3c43815cd2b0e4d02eecc4819 # v0.1.11

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/repos/devops-actions/actionlint/git/refs/tags/v0.1.11
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure 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 (admins only)

Original prompt

Add a new workflow that triggers on changes in the .github/workflows folder. Name it "actionlint" and implement a call to the DevOps-actions/actionlint action in it, to lint our actions workflows for common (security) issues.

Check the action readme for examples. Use the latest version.

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💡 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 in the docs.