Set filter_mode: nofilter and fail_on_error: true for reviewdog linters

- `nofilter` means it will check the entire repository not just the stuff added in the most recent commit of the PR
- `fail_on_error` means the github action fails (e.g. shows up red instead of green)

.github/workflows/linters.yml

@@ -18,6 +18,8 @@ jobs:
           # GitHub Status Check won't become failure with warning.
           level: warning
           glob_pattern: "**/*.py"
+          filter_mode: nofilter
+          fail_on_error: true
 
   black:
     name: runner / black
@@ -29,11 +31,13 @@ jobs:
         id: action_black
         with:
           black_args: "."
+          fail_on_error: true
       - name: Annotate diff changes using reviewdog
         if: steps.action_black.outputs.is_formatted == 'true'
         uses: reviewdog/action-suggester@v1
         with:
           tool_name: blackfmt
+          # NOTE: the reviewdog filter_mode is diff_context - this is the only thing supported by GitHub suggestions
 
   markdownlint:
     name: runner / markdownlint
@@ -45,6 +49,8 @@ jobs:
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           reporter: github-pr-check
+          filter_mode: nofilter
+          fail_on_error: true
 
   rubocop:
     name: runner / rubocop
@@ -62,3 +68,5 @@ jobs:
           reporter: github-pr-check
           skip_install: true
           use_bundler: true
+          filter_mode: nofilter
+          fail_on_error: true