Add DevSkim workflow for code scanning (#479)

# Description
This pull request introduces a new GitHub Actions workflow to integrate
DevSkim, an automated security scanning tool, into the CI/CD pipeline.
The workflow runs on pushes, pull requests, and on a weekly schedule,
scanning code for security issues and uploading results to the GitHub
Security tab.

**Security and CI/CD Integration:**

* Added a new workflow file `.github/workflows/devskim.yml` to automate
DevSkim security scans on the `main` branch for pushes, pull requests,
and on a weekly schedule. The workflow checks out the code, runs the
DevSkim scanner, and uploads the results in SARIF format to GitHub's
Security tab.

# Change type
- [ ] Bug fix (non-breaking change)
- [ ] Code style update (formatting, local variables)
- [] New Feature (non-breaking change that adds new functionality
without impacting existing)
- [ ] Breaking change (fix or feature that may cause functionality
impact)
- [x] Other

# Checklist:
- [x] My code follows the style and contribution guidelines of this
project.
- [x] I have tested and validated my code changes.

Author: arudell

.github/workflows/devskim.yml

@@ -0,0 +1,34 @@
+# This workflow uses actions that are not certified by GitHub.
+# They are provided by a third-party and are governed by
+# separate terms of service, privacy policy, and support
+# documentation.
+
+name: DevSkim
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+  schedule:
+    - cron: '20 13 * * 3'
+
+jobs:
+  lint:
+    name: DevSkim
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Run DevSkim scanner
+        uses: microsoft/DevSkim-Action@v1
+
+      - name: Upload DevSkim scan results to GitHub Security tab
+        uses: github/codeql-action/upload-sarif@v3
+        with:
+          sarif_file: devskim-results.sarif