chore: add security scanning workflows

[haribabug]

Security Scanning Workflows

This PR adds standardised security scanning configuration from ROCm/rocm-repo-template.

Files added / updated

• .github/workflows/pr-security-scan.yml — scans every pull request
• .github/workflows/weekly-security-scan.yml — scheduled weekly scan
• .github/dependabot.yml — automated dependency updates
• .github/scan_tools_configs/bandit.yml — Python static analysis config
• .github/scan_tools_configs/gitleaks.toml — secret detection config
• .github/scan_tools_configs/trivy.yml — container/dependency vulnerability config
• .github/scan_tools_configs/zizmor.yml — GitHub Actions security config

Why

Aligns this repository with the ROCm organisation security baseline.

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For more details, refer ROCm GitHub Org Security Controls Baseline Architecture

Support/Questions: Teams Channel ROCm Security Discussions

[github-advanced-security]

You are seeing this message because GitHub Code Scanning has recently been set up for this repository, or this pull request contains the workflow file for the Code Scanning tool.

What Enabling Code Scanning Means:

• The 'Security' tab will display more code scanning analysis results (e.g., for the default branch).
• Depending on your configuration and choice of analysis tool, future pull requests will be annotated with code scanning analysis results.
• You will be able to see the analysis results for the pull request's branch on this overview once the scans have completed and the checks have passed.

For more information about GitHub Code Scanning, check out the documentation.

[haribabug]

Deleting this PR