This is an example Buildkite pipeline that will show a block step for deploys if the date command on the agent returns "Friday". Here's what the step looks like:
If you respond with "Yes, I'm sure. If something goes wrong, I'll fix it", it'll run the deploy.sh file again but allow the deploy through like usual:
However if you respond with "Err, nah. I've changed my mind", it will still run the deploy.sh step, but the build will fail, essentially "blocking" this build from being deployed.
See License.md (MIT)