chore: link libm for posix systems

Author: kevaundray

bindings/nim/nim_code/tests/test_yaml.nim

@@ -1,3 +1,9 @@
+# Currently libm does not seem to be getting linked in for tests
+# CI error was failing to fetch the ceil method when calling num_cpus from
+# the rust code.
+when defined(posix):
+  {.passL: "-lm".}
+
 # This file was copied and modified from c-kzg
 import
   std/[os, sequtils, strutils, streams],