Add canary workflow

[ChristianMurphy]

Initial checklist

• [x] I read the support docs
• [x] I read the contributing guide
• [x] I agree to follow the code of conduct
• [x] I searched issues and couldn’t find anything (or linked relevant results below)
• [x] If applicable, I’ve added docs and tests

Description of changes

Follow up to: https://github.com/unifiedjs/ideas/issues/7

Unified is a large and highly connected community of packages. Changes to any package could have impact downstream packages. Currently anticipating impact is a purely manual process.

It could be helpful to use downstream packages, which themselves have comprehensive test suites, to help automatically detect what changes may be breaking or have unintended impacts.

[codecov-commenter]

Codecov Report

Merging #182 (5414b70) into main (45b3d3f) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##              main      #182   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines          600       600           
=========================================
  Hits           600       600           

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[ChristianMurphy]

unifiedjs/unified-args#27 and rehypejs/rehype#82 have been opened to address the two build failures seen in the canary build

[ChristianMurphy]

the mdx-js/mdx build is flagging:

lib/compile.js(28,43): error TS2345: Argument of type 'VFile' is not assignable to parameter of type 'VFileCompatible'.
  Type 'VFile' is not assignable to type 'VFileOptions'.
    Type 'VFile' is not assignable to type '{ [key: string]: unknown; }'.
      Index signature for type 'string' is missing in type 'VFile'.
lib/compile.js(42,47): error TS2345: Argument of type 'VFile' is not assignable to parameter of type 'VFileCompatible | undefined'.
  Type 'VFile' is not assignable to type 'VFileOptions'.
    Type 'VFile' is not assignable to type '{ [key: string]: unknown; }'.

https://github.com/unifiedjs/unified/runs/4669887032?check_suite_focus=true#step:6:52

which looks like it may be related to vfile/vfile/pull/64 /cc @remcohaszing

though it is odd that https://github.com/vfile/vfile/pull/69 should (in theory) do the same test, and didn't see on mdx-js/mdx, it only saw it on vfile/to-vfile :thinking:

[wooorm]

sweet!

[github-actions[bot]]

Hi! This was closed. Team: If this was merged, please describe when this is likely to be released. Otherwise, please add one of the no/* labels.