yamlfix breaks volumes: ["/a:/b"] by removing the quoting, making the list item a mapping

[lalten]

Description

yamlfix breaks volumes: ["/a:/b"] by removing the quoting, making the list item a mapping.

See https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idcontainervolumes

It looks like this is a ruyaml bug as this happens in

yamlfix/src/yamlfix/adapters.py

Line 382 in 47039c9

self.yaml.dump(source_dict, string_stream)

Steps to reproduce

❯ yamlfix - <<<'volumes: ["/a:/b"]'
[+] YamlFix: Fixing files
[+] Fixed <stdin>
---
volumes: [/a:/b]

Current behavior

yamlfix breaks volumes: ["/a:/b"] by removing the quoting, making the list item a mapping.

Desired behavior

Don't break the yaml on formatting

Environment

yamlfix: 1.16.0
Python: 3.10.12
Platform: Linux-6.5.0-1018-oem-x86_64-with-glibc2.35

[lalten]

It seems this is a bug in check-yaml which complains

while scanning a plain scalar
  in ".github/workflows/workflow.yml", line 19, column 17
found unexpected ':'
  in ".github/workflows/workflow.yml", line 19, column 43

Some testing with yq shows that this seems to be ok yaml:

❯ yq <<<'volumes: [a:b]'
{
  "volumes": [
    "a:b"
  ]
}
❯ yq <<<'volumes: ["a:b"]'
{
  "volumes": [
    "a:b"
  ]
}
❯ yq <<<'volumes: ["a: b"]'
{
  "volumes": [
    "a: b"
  ]
}
❯ yq <<<'volumes: [a: b]'
{
  "volumes": [
    {
      "a": "b"
    }
  ]
}

actionlint also has no issue with volumes: [a:b]

[lalten]

I take it back, GitHub Actions complains

The workflow is not valid. .github/workflows/build.yaml: (Line: 193, Col: 17, Idx: 6509) - (Line: 193, Col: 42, Idx: 6534): While scanning a plain scalar, find unexpected ':'.