fix: add lakefile.tom detection to detect_mathlib.sh (#9)

scripts/detect_mathlib.sh

@@ -2,8 +2,13 @@
 
 echo "Trying to detect if project is downstream of Mathlib."
 
-# Check if the lakefile.lean file contains "require mathlib"
-if grep -q "require mathlib" lakefile.lean; then
+# define mathlib dependency patterns for lakefile.lean and lakefile.toml
+dot_lean_pattern="require mathlib"
+dot_toml_pattern="\[\[require\]\]\nname = \"mathlib\"\ngit = \"https://github.com/leanprover-community/mathlib4"
+
+# Check if lakefile.lean or lakefile.toml contain the mathlib dependency pattern
+if grep -q "$dot_lean_pattern" lakefile.lean || grep -Pzq "$dot_toml_pattern" lakefile.toml; then
+  # Set the DETECTED_MATHLIB variable to true and send it to the GitHub action output to be used in later steps
   echo "DETECTED_MATHLIB=true" >> "$GITHUB_OUTPUT"
   echo "Project is downstream of Mathlib. Using Mathlib cache."
 else