feat: Add support for running inside a matrix by overriding the default correlator identifier

[felickz]

This pull request introduces support for running the action inside a matrix by enhancing the correlator functionality, updates the action's input configuration, and modifies the main script to utilize the new correlator input.

Inspiration: wanted to loop through all SBOM samples in spdx sample repo via dependency_submission.yml but noticed all the correlators were taking the name of my job only (not the name of the job+matrix instance).

Matrix Support and Correlator Enhancements:

• README.md: Added instructions for defining a correlator that includes job and matrix values, and provided a sample YAML configuration for SBOM upload. (View rendered markdown)
• action.yml: Introduced a new input correlator with a description and default value set to ${{ github.job }}.
• index.js: Modified the correlator property in the Snapshot object to use the value from the new correlator input instead of the default ${github.context.job}.

Before: job only:

After: support for job(matrixValue1, matrixValue2, ...):

Sample

Using sample provided in readme, can have the correlator match the action job naming:

[github-actions]

Dependency Review

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

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[GeekMasher]

Looks good to me!