Add yamlfmt pre-commit hook

[codingjoe]

I noticed that the YAML indentation is all over the place. There's a handy linter for that.

[Copilot]

Pull request overview

This PR standardizes YAML formatting across the repository by adding yamlfmt to the existing prek/pre-commit hook set and applying the formatter’s indentation/style to existing YAML files.

Changes:

• Add google/yamlfmt as a new hook in .pre-commit-config.yaml and stop Prettier from targeting YAML files.
• Reformat existing YAML files (docker compose, GitHub Actions workflows, Dependabot config) to consistent 2-space indentation.
• Update .editorconfig to explicitly set YAML indentation to 2 spaces.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
docker-compose.yml	Re-indented to a consistent 2-space YAML style.
.pre-commit-config.yaml	Adds yamlfmt hook and excludes YAML from Prettier to avoid formatter overlap.
.github/workflows/tests.yml	Re-indented for consistency with the new YAML formatter.
.github/workflows/prek.yml	Re-indented for consistency with the new YAML formatter.
.github/workflows/docker-test-build.yml	Re-indented for consistency with the new YAML formatter.
.github/workflows/docker-publish.yml	Re-indented for consistency with the new YAML formatter.
.github/dependabot.yml	Re-indented for consistency with the new YAML formatter.
.editorconfig	Sets YAML files to indent_size = 2 to match formatting expectations.

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[codingjoe]

cc @ulgens since we previously taked about it