ci(super-linter): stop Trivy from calling Maven Central

[thomasleplus]

Readiness checklist

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required guidelines for contributions:

• If this pull request includes code changes, they were all properly tested. Automated tests were also included where possible.
• If applicable, this pull request includes the relevant documentation for this change.
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Description

Maven Central answers "429 Too Many Requests" to Trivy's user agent from any IP, and Trivy 0.71.1 (shipped with super-linter v8.7.0) resolves parent and BOM POMs even when its vulnerability scanner is disabled, so every run aborted with a fatal error.

Set TRIVY_OFFLINE_SCAN to stop Trivy issuing those requests, and restore the Maven workflow's dependency cache into the home directory that the super-linter container sees, so Trivy still resolves the full dependency tree from disk on the runs that scan for vulnerabilities. A cache miss now costs coverage (a warning) instead of failing the run.

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

OpenSSF Scorecard

Package	Version	Score	Details
actions/actions/cache/restore	55cc8345863c7cc4c66a329aec7e433d2d1c52a9	🟢 6.4	Details Check Score Reason Maintained 🟢 10 13 commit(s) and 0 issue activity found in the last 90 days -- score normalized to 10 Code-Review 🟢 10 all changesets reviewed Binary-Artifacts 🟢 10 no binaries found in the repo Packaging ⚠️ -1 packaging workflow not detected Dangerous-Workflow 🟢 10 no dangerous workflow patterns detected CII-Best-Practices ⚠️ 0 no effort to earn an OpenSSF best practices badge detected Token-Permissions ⚠️ 0 detected GitHub workflow tokens with excessive permissions Pinned-Dependencies 🟢 3 dependency not pinned by hash detected -- score normalized to 3 Fuzzing ⚠️ 0 project is not fuzzed License 🟢 10 license file detected Signed-Releases ⚠️ -1 no releases found Security-Policy 🟢 9 security policy file detected Branch-Protection ⚠️ 1 branch protection is not maximal on development and all release branches SAST 🟢 10 SAST tool is run on all commits

Scanned Files

• .github/workflows/super-linter.yml