Update docker/login-action action to v4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
docker/login-action	action	major	v3 → v4

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Release Notes

docker/login-action (docker/login-action)

v4

Compare Source

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[sagzy]

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📥 Commits

Reviewing files that changed from the base of the PR and between 3cb8377 and 2a1744d.

📒 Files selected for processing (2)

• .github/workflows/build.yml
• .github/workflows/push.yml

✨ Finishing Touches

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• Commit unit tests in branch renovate/docker-login-action-4.x

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[Copilot]

Pull request overview

Updates the GitHub Actions workflows to use docker/login-action@v4 (from v3) for Docker registry authentication during build/push pipelines.

Changes:

• Bump docker/login-action from v3 to v4 in the push workflow (GCP Artifact Registry + GHCR logins).
• Bump docker/login-action from v3 to v4 in the build workflow (GCP Artifact Registry login for reconcile-account-topics job).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
.github/workflows/push.yml	Updates Docker login action to v4 for both registry logins.
.github/workflows/build.yml	Updates Docker login action to v4 for GCP Artifact Registry login.

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