Update README.md (#76)

containrrr · Nov 14, 2024 · e966e8f · e966e8f
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@@ -35,3 +35,7 @@ parts of the URL in a GitHub secret.
 
 Not all services support the `title` option. It's optional and you can
 leave it out.
+
+> [!NOTE]
+> This action is only supported on Linux runners.
+> See <https://docs.github.com/en/actions/sharing-automations/creating-actions/about-custom-actions#types-of-actions>