chore(dev): bump docker/build-push-action to latest

[brendan-kellam]

Summary by CodeRabbit

• Chores
  • Updated CI build tooling used for Docker image builds to a newer action to ensure continued compatibility and stability.
  • Applied the same build tooling update across pull-request and main pipeline workflows to keep builds consistent.

[github-actions]

@brendan-kellam your pull request is missing a changelog!

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 7e68a524-5a4a-4bde-965b-ee88d1fe2ad0

📥 Commits

Reviewing files that changed from the base of the PR and between bcf8eb8 and cc189e5.

📒 Files selected for processing (1)

• .github/workflows/pr-gate.yml

✅ Files skipped from review due to trivial changes (1)

• .github/workflows/pr-gate.yml

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Walkthrough

The GitHub Actions workflows .github/workflows/_build.yml and .github/workflows/pr-gate.yml were updated to use docker/build-push-action@v7 instead of @v6. All other step inputs and configuration are unchanged.

Changes

GitHub Actions: build-push action bump

Layer / File(s)	Summary
Action Version .github/workflows/_build.yml, .github/workflows/pr-gate.yml	Updated docker/build-push-action reference from v6 to v7 in the Docker image build step.
Workflow Context .github/workflows/_build.yml, .github/workflows/pr-gate.yml	No other workflow inputs, build args, cache settings, platforms, or outputs were modified.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: updating docker/build-push-action from v6 to v7 across workflow files, which is the primary objective of this changeset.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch bkellam/update-build-push-action

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