Merge pull request #2365 from buildkite/input-secret-note

Update input_step.md

Author: nsuma8989

pages/pipelines/input_step.md

@@ -44,6 +44,9 @@ For an example pipeline, see the [Input step example pipeline](https://github.c
 
 <a class="Docs__example-repo" href="https://github.com/buildkite/input-step-example"><span class="detail">:pipeline: Input Step Example Pipeline</span> <span class="repo">github.com/buildkite/input-step-example</span></a>
 
+>🚧 Don't store sensitive data in input steps
+> You shouldn't use input steps to store sensitive information like secrets because the data will be stored in build metadata.
+
 ## Input step attributes
 
 Input and block steps have the same attributes available for use.