feat(ci): add yamllint config

---

extends: 'default'

rules:

  braces:

    max-spaces-inside: 1

    forbid: true

  comments:

    min-spaces-from-content: 1

  comments-indentation: false

  empty-lines:

    max: 2

  indentation:

    spaces: 2

    check-multi-line-strings: true

  line-length:

    max: 130

    allow-non-breakable-words: true

    allow-non-breakable-inline-mappings: true

  new-line-at-end-of-file: 'enable'

  octal-values:

    forbid-implicit-octal: true

    forbid-explicit-octal: true

  truthy:

    allowed-values:

      - 'true'

      - 'false'

  quoted-strings:

    quote-type: 'any'

    required: true