Update pr-welcome-internal.md

Author: aaronsteers

.github/pr-welcome-internal.md

@@ -26,6 +26,7 @@ Airbyte Maintainers can execute the following slash commands on your PR:
 - `/autofix` - Fixes most formatting and linting issues
 - `/poetry-lock` - Updates poetry.lock file
 - `/test` - Runs connector tests with the updated CDK
+- `/poe build` - Regenerate git-committed build artifacts, such as the source declarative manifest JSON schema in YAML.
 - `/poe <command>` - Runs any poe command in the CDK environment
 
 [📝 _Edit this welcome message._](https://github.com/airbytehq/airbyte-python-cdk/blob/main/.github/pr-welcome-internal.md)