ci: react +1 on comment that triggered execution

.github/workflows/bot.yml

@@ -42,7 +42,7 @@ jobs:
               echo $GPTME_COMMAND
               echo "EOFMAGIC"
             } >> $GITHUB_OUTPUT
-            cat $GITHUB_OUTPUT
+
           fi
 
       - name: Fail if author not on whitelist
@@ -58,6 +58,14 @@ jobs:
             echo "Author ${COMMENT_AUTHOR} is on the whitelist."
           fi
 
+      - name: React to comment
+        env:
+          REPO_NAME: ${{ github.event.repository.name }}
+          USER_NAME: ${{ github.event.repository.owner.login }}
+          COMMENT_ID: ${{ github.event.comment.id }}
+        run: |
+          gh api /repos/$USER_NAME/$REPO_NAME/issues/comments/$COMMENT_ID/reactions -X POST -f content='+1'
+
   execute-command:
     needs: check-comment
     if: needs.check-comment.outputs.gptme_command