chore: YAML format on save

[jkjuopperi]

Use the default redhat.vscode-yaml plugin and set up formatting yaml files on save.
This also trims the trailing whitespace.

Trimming trailing whitespace could be achieved with "files.trimTrailingWhitespace": true setting, but it likely makes sense to have automatic YAML formatting and fix indentation to two spaces.

[japsu]

I would prefer not adding a separate formatter plugin for each and every file type in the repository. That being said, YAML is so prevalent in the project and gives so much freedom in formatting that I think having a formatter for YAML would be a good idea. Then we can start fighting about how lists should be indented :) /joke

It occurs to me, that Prettier supports YAML and we already have the esbenp.prettier-vscode recommended under frontend. Could that same plugin be used to format in backend despite it not being a Node.js project?

[jkjuopperi]

We could put the default formatter and also the YAML settings to workspace configuration.

Would it make sense to have the final newline and whitespace trim settings workspace wide also?

  "settings": {
    "editor.defaultFormatter": "esbenp.prettier-vscode",
    "files.insertFinalNewline": true,
    "files.trimTrailingWhitespace": true,
    "[yaml]": {
      "editor.insertSpaces": true,
      "editor.tabSize": 2,
      "editor.formatOnSave": true
    }
  },
  "extensions": {
    "recommendations": ["esbenp.prettier-vscode"]
  }

[japsu]

Yes, it makes very much sense 👍