Include link in github-pr-review output

[jrobison-sb]

When I run tflint --chdir=path/to/my/module/ --format=checkstyle using vanilla tflint (outside the context of this GitHub Action, and outside the context of ReviewDog), I can get output like this which includes a link to the tflint docs so I can fix whatever it complains about:

    <error source="terraform_unused_declarations" line="844" column="1" severity="warning" message="variable &#34;unused_variable&#34; is declared but not used" link="https://github.com/terraform-linters/tflint-ruleset-terraform/blob/v0.8.0/docs/rules/terraform_unused_declarations.md" rule="terraform_unused_declarations"></error>

But when I see the same error using this GitHub Action and using reporter: github-pr-review, it includes no such link.

It would be nicer if the link was included in the PR comment so the person could be pointed towards whatever they need to do to fix their mistake.

[jrobison-sb]

Here is my full action, in case that is helpful:

name: tflint
on:
  pull_request:
    paths:
      - 'path/to/my/module/*.tf'

jobs:
  tflint:
    name: tflint
    runs-on: ubuntu-latest

    steps:
      - name: Clone repo
        uses: actions/checkout@v4

      - name: tflint
        uses: reviewdog/action-tflint@v1
        with: # https://github.com/reviewdog/action-tflint#inputs
          github_token: ${{ secrets.GITHUB_TOKEN }}
          working_directory: "path/to/my/module" # Optional. Change working directory
          reporter: github-pr-review # Post the output as PR comments
          fail_on_error: "true" # Optional. Fail action if errors are found
          filter_mode: "added" # Optional. Only complain about the diffs in the PR. https://github.com/reviewdog/reviewdog/tree/master?tab=readme-ov-file#filter-mode
          tflint_init: "true" # Optional. Run `tflint --init` before running code analysis
          flags: "" # Optional. Add custom tflint flags