Specify secrets.SLACK_WEBHOOK_URL

The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

Unexpected input(s) 'token', valid inputs are ['status', 'fields', 'custom_payload', 'mention', 'if_mention', 'author_name', 'text', 'username', 'icon_emoji', 'icon_url', 'channel', 'job_name', 'github_token', 'github_base_url']