actions/*: streamline workflows into reusable actions

[thypon]

No description provided.

[github-actions]

[puLL-Merge] - brave/security-action@618

Description

This PR refactors the GitHub Actions in the security-action repository to use reusable action components. Rather than duplicating code in each workflow, the workflows now reference actions defined in the actions/ directory.

Changes

Changes

• .github/workflows/add-maintainer-custom-property.yml: Replaced inline script with a call to the brave/security-action/actions/add-maintainer-custom-property@main action. Moved input parameters to the with block.
• .github/workflows/check-new-repos.yml: Replaced inline script with a call to the brave/security-action/actions/check-new-repos@main action. Moved input parameters to the with block.
• .github/workflows/dependabot-auto-dismiss.yml: Replaced inline script with a call to the brave/security-action/actions/dependabot-auto-dismiss@main action. Moved input parameters to the with block.
• .github/workflows/dependabot-nudge.yml: Replaced inline script with a call to the brave/security-action/actions/dependabot-nudge@main action. Moved input parameters to the with block.
• .github/workflows/older-than-2y.yml: Replaced inline script with a call to the brave/security-action/actions/older-than-2y@main action. Moved input parameters to the with block.
• .github/workflows/renovate-sanity-check.yml: Replaced inline script with a call to the brave/security-action/actions/renovate-sanity-check@main action. Moved input parameters to the with block.
• Added new actions/ directory containing reusable action components:
  • actions/add-maintainer-custom-property/: Action to add maintainer as a custom property to all repos
  • actions/check-new-repos/: Action to check for new repositories created in the last day
  • actions/dependabot-auto-dismiss/: Action to automatically dismiss certain Dependabot PRs based on rules defined in dismiss.txt
  • actions/dependabot-nudge/: Action to nudge maintainers about open Dependabot PRs
  • actions/older-than-2y/: Action to find repositories that haven't been updated in 2+ years
  • actions/renovate-sanity-check/: Action to check all repositories follow the central Renovate config
• Moved .github/dependabot-dismiss.txt to actions/dependabot-auto-dismiss/dismiss.txt

The reusable actions import shared utility functions like sendSlackMessage from the src/ directory. Debug logging is controlled by a debug input parameter.

Possible Issues

No major issues identified. The change looks straightforward and well-structured. The only suggestion would be to consider validating the gh_to_slack_user_map input in dependabot-nudge more gracefully than relying on a try/catch.