Allow users to pass in a custom linting configuration

Author: kendallgassner

README.md

@@ -67,6 +67,22 @@ This makes sure you stay on a stable version of this action.
 
 Replace the ref value with any commit hash.
 
+### Adding a custom linting configuration
+
+If you would like to include more linting rules from the [markdownlint](https://github.com/DavidAnson/markdownlint) or [markdownlint-github](https://github.com/github/markdownlint-github) rulesets pass a config object to the `github/accessibility-alt-text-bot` action.
+
+```yml
+    steps:
+      - name: Check alt text  #change this step to use the
+        uses: github/[email protected]
+        with:
+          config: |
+            no-default-alt-text: true,
+            no-alt-text: true,
+            no-empty-alt-text: true,
+            no-generic-link-text: true,
+```
+
 ## License
 
 This project is licensed under the terms of the MIT open source license.

action.yml

@@ -61,7 +61,7 @@ runs:
             bot_comment_id=$(gh api repos/${{ github.repository }}/discussions/${{ github.event.discussion.number }}/comments | jq -r '.[] | select(.user.login == "github-actions[bot]") | select(.body | test("<div alt-text-bot-id=\"${{ github.event.discussion.id }}\"")) | .node_id')
           fi
         fi
-        flag=$(node ${{ github.action_path }}/src/index.js "$content")
+        flag=$(node ${{ github.action_path }}/src/index.js "$content" "$CONFIG")
         message="<div alt-text-bot-id=\"$target_id\" /> Uh oh! @$user, at least one image you shared is missing helpful alt text. Check $target to fix the following violations:
 
         $flag 
@@ -115,3 +115,4 @@ runs:
         ISSUE_BODY: ${{ github.event.issue.body }}
         PR_BODY: ${{ github.event.pull_request.body }}
         DISCUSSION_BODY: ${{ github.event.discussion.body }}
+        CONFIG: ${{ inputs.config }}