Upgrade GitHub Actions versions in workflow

[kavitaa30]

Summary

Updated deprecated GitHub Actions versions in the Container Apps
GitHub Actions workflow documentation.

Changes

• Updated azure/login from v1 to v2
• Updated actions/checkout from v3 to v4

Reason

These older versions are deprecated and may cause security warnings
in GitHub workflows. Using latest stable versions aligns with current
GitHub Actions best practices.

[prmerger-automator]

@kavitaa30 : Thanks for your contribution! The author(s) and reviewer(s) have been notified to review your proposed change.

[prmerger-automator]

@kavitaa30 : Thanks for your contribution! The author(s) and reviewer(s) have been notified to review your proposed change.

[learn-build-service-prod]

Learn Build status updates of commit 0d5e3bb:

✅ Validation status: passed

File	Status	Preview URL	Details
articles/container-apps/github-actions.md	✅Succeeded

For more details, please refer to the build report.

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Updates the Container Apps GitHub Actions workflow documentation to use current, non-deprecated GitHub Actions versions to avoid deprecation/security warnings.

Changes:

• Updated azure/login usage from @v1 to @v2 in all documented workflow snippets.
• Updated actions/checkout usage from @v3 to @v4 in the documented workflow.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[v-dirichards]

@craigshoemaker

Can you review the proposed changes?

Important: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged"
@MicrosoftDocs/public-repo-pr-review-team