Add support for discussion comment

Author: khiga8

.github/workflows/test-accessibility-alt-text-bot.yml

@@ -8,6 +8,8 @@ on:
     types: [created, edited]
   discussion:
     types: [created, edited]
+  discussion_comment:
+    types: [created, edited]
 
 jobs:
   accessibility_alt_text_bot:

action.yml

@@ -12,12 +12,17 @@ runs:
 
           if [ ${{ github.event.comment }} ]; then
             content=$COMMENT
-            issue_url=${{ github.event.issue.html_url }}
             user=${{ github.event.comment.user.login }}
             if ${{ github.event.issue.pull_request.url != '' }}; then
               type=pr_comment
+              issue_url=${{ github.event.issue.html_url }}
+            elif ${{ github.event.discussion.id != '' }}; then
+              type=discussion_comment
+              discussion_node_id='${{ github.event.discussion.node_id }}'
+              reply_to_id='${{ github.event.comment.node_id }}'
             else
               type=issue_comment
+              issue_url=${{ github.event.issue.html_url }}
             fi
             target=${{ github.event.comment.html_url }}
           else
@@ -66,6 +71,16 @@ runs:
                   }
                 }
               '
+            elif [[ $type = discussion_comment ]]; then
+              gh api graphql -F discussionId="$discussion_node_id" -F replyToId="$reply_to_id" -F body="$message" -f query='
+                mutation($discussionId: ID!, , $replyToId: ID, $body: String!) {
+                  addDiscussionComment(input: {discussionId: $discussionId, replyToId: $replyToId, body: $body}) {
+                    comment {
+                      id
+                    }
+                  }
+                }
+              '
             fi
           fi
       shell: bash