ci: Add SARIF upload to GitHub Security Dashboard

[jkan2]

Since the findings are located in the semgrep UI, this will allow it to be uploaded to the security dashboard (under code scanning in the security tab). The python script is from semgrep themselves and it transforms the original sarif from semgrep to a more useable readable format in GHAS.

Summary by CodeRabbit

• New Features
  • Enhanced workflow for running Semgrep, including conditional execution and improved output formats.
  • Added functionality to convert Semgrep results to SARIF format for better integration with GitHub Advanced Security Dashboard.

[coderabbitai[bot]]

📝 Walkthrough

## Walkthrough The changes to the `.github/workflows/semgrep.yml` file enhance the Semgrep workflow by adding conditional execution based on the actor, incorporating a repository checkout step, modifying the output format to JSON, and introducing a conversion to SARIF format. Additionally, the updated workflow includes uploading the SARIF file to the GitHub Advanced Security Dashboard. ## Changes | File | Change Summary | |-------------------------------|--------------------------------------------------------------------------------| | .github/workflows/semgrep.yml | - Added conditional check to skip execution for 'dependabot[bot]'.
- Included a step to check out the `semgrep-utilities` repository.
- Modified Semgrep command to output results in JSON format to `semgrep-findings.json`.
- Added a step to convert JSON output to SARIF format, saving as `semgrep-github.sarif`.
- Included a step to upload the SARIF file to GitHub Advanced Security Dashboard. | ## Possibly related PRs - #360: This PR modifies the existing Semgrep workflow in `.github/workflows/semgrep.yml`, directly connecting to the initial workflow introduced in the same file. ## Suggested reviewers - fadeev - skosito - CharlieMc0 - andresaiello - brewmaster012 - lumtis - fbac

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[github-advanced-security[bot]]

This pull request sets up GitHub code scanning for this repository. Once the scans have completed and the checks have passed, the analysis results for this pull request branch will appear on this overview. Once you merge this pull request, the 'Security' tab will show more code scanning analysis results (for example, for the default branch). Depending on your configuration and choice of analysis tool, future pull requests will be annotated with code scanning analysis results. For more information about GitHub code scanning, check out the documentation.