Support annotations

[dveeden]

Related: lycheeverse/lychee#1637

This is what I got working:

.github/lychee-problem-matcher.json:

{
	"problemMatcher": [
		{
			"owner": "lychee",
			"pattern": [
				{
					"regexp": "^\\[(.*)\\]:$",
					"file": 1
				},
				{
					"regexp": "^\\s*\\[ERROR\\] (.*)$",
					"message": 1,
					"loop": true
				}
			]
		}
	]
}

      - run: echo "::add-matcher::.github/lychee-problem-matcher.json"
      - name: Link Checker
        if: ${{ steps.changed-files.outputs.all_changed_files }}
        uses: lycheeverse/lychee-action@v2.3.0
        with:
          fail: true
          args: --root-dir $(pwd) -E -i -n -t 45 -- '${{ steps.changed-files.outputs.all_changed_files }}'
          format: compact
        env:
          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
          NO_COLOR: 1

Resulting in this:

However the line number is missing in the output, so the annotation doesn't get added to the right place in the file

[mre]

Great progress! I like the output. As mentioned in the linked issue, I think we need to add support for line numbers first. Some parsers don't support that out of the box, but there are workarounds like searching through the files ourselves.