Scorecard file level checks

[djanickova]

Hey, I just made a Pull Request!

This PR introduces a new type of scorecard: file level checks (RHDHPLAN-397). This adds ability for Scorecard to verify if a list of required files (one or more) is present (such as a license, CODEOWNERS, dockerfile, .gitignore, etc). The paths to these files are configurable.

Example of these scorecards on the entity page:

Example of these scorecards on homepage:

Example config:

scorecard:
  plugins:
    github:
      files_check:
        files:
          - readme: 'README.md'
          - i18guide: 'docs/backstage-i18n-guide.md'
        schedule:
          frequency: { minutes: 5 }
          timeout: { minutes: 10 }
          initialDelay: { seconds: 5 }

The contents of this PR have been reviewed in 2 separate previous PRs within my fork:
djanickova#1
djanickova#2

✔️ Checklist

• A changeset describing the change and affected packages. (more info)
• Added or Updated documentation
• Tests for new functionality and regression tests for bug fixes
• Screenshots attached (for UI changes)

[github-actions]

This pull request adds a new top-level directory under workspaces/. Please follow Submitting a Pull Request for a New Workspace in CONTRIBUTING.md.

[rhdh-gh-app]

Missing Changesets

The following package(s) are changed by this PR but do not have a changeset:

• @red-hat-developer-hub/backstage-plugin-scorecard-backend-module-github
• @red-hat-developer-hub/backstage-plugin-scorecard-backend
• @red-hat-developer-hub/backstage-plugin-scorecard-node
• @red-hat-developer-hub/backstage-plugin-scorecard

See CONTRIBUTING.md for more information about how to add changesets.

Changed Packages

Package Name	Package Path	Changeset Bump	Current Version
app-legacy	workspaces/scorecard/packages/app-legacy	none	v0.0.0
@red-hat-developer-hub/backstage-plugin-scorecard-backend-module-github	workspaces/scorecard/plugins/scorecard-backend-module-github	none	v2.4.0
@red-hat-developer-hub/backstage-plugin-scorecard-backend	workspaces/scorecard/plugins/scorecard-backend	none	v2.4.0
@red-hat-developer-hub/backstage-plugin-scorecard-node	workspaces/scorecard/plugins/scorecard-node	none	v2.4.0
@red-hat-developer-hub/backstage-plugin-scorecard	workspaces/scorecard/plugins/scorecard	none	v2.4.0

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud