Add warning to docs about ubuntu-latest incompatability

Author: drewcassidy

docs/actions/compile.md

@@ -1,7 +1,12 @@
 # Compile
 
-```{gh-actions:action}
----
-path: .github/actions/compile
----
-```
+````{gh-actions:action}
+:path: .github/actions/compile
+
+```{warning}
+Due to the [handover of the Mono project](https://github.com/mono/mono/issues/21796), the `ubuntu-latest` github runner [does not currently include mono or nuget](https://github.com/actions/runner-images/issues/10636#issuecomment-2375010324). 
+
+Please use the `ubuntu-22.04` runner for this action.
+```
+
+````