feat: implement security scanning workflows (CodeQL, ZAP, Gitleaks, Dependabot)

[Aditya948351]

This PR adds comprehensive security scanning to the repository CI/CD pipeline, including CodeQL for SAST, ZAP for DAST, Gitleaks for secret scanning, and automated Dependabot configuration.

[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.

[Copilot]

Pull request overview

This PR adds repository-level security automation by introducing GitHub Actions workflows for SAST (CodeQL), secret scanning (Gitleaks), and DAST (OWASP ZAP), plus a Dependabot configuration to keep dependencies updated.

Changes:

• Add a CodeQL workflow to run scheduled and PR/push static analysis.
• Add Gitleaks secret scanning on PR/push.
• Add an OWASP ZAP baseline scan workflow that builds and serves the Next.js app for local scanning, and add Dependabot update schedules.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 5 comments.

File	Description
.github/workflows/zap-api-scan.yml	Adds a ZAP baseline scan against a locally started Next.js server.
.github/workflows/gitleaks.yml	Adds a Gitleaks workflow for secret scanning on PRs/pushes.
.github/workflows/codeql.yml	Adds CodeQL analysis workflow (PR/push + scheduled).
.github/dependabot.yml	Configures weekly Dependabot updates for npm and GitHub Actions.

Comments suppressed due to low confidence (2)

.github/workflows/codeql.yml:30

• steps: is followed by list items that are not indented under it. This makes the workflow YAML invalid and will prevent the CodeQL job from running. Indent all - name: entries so they are children of steps:.

    steps:
    - name: Checkout repository
      uses: actions/checkout@v4

    - name: Initialize CodeQL
      uses: github/codeql-action/init@v3

.github/workflows/codeql.yml:24

• The CodeQL language is set to javascript, but this repo is primarily TypeScript/TSX (Next.js). Use the javascript-typescript CodeQL language so TypeScript is analyzed correctly.

      matrix:
        language: [ 'javascript' ]

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