chore: add comment to abigen build script (#16430)

Author: RayXpub

tools/bin/build_abigen

@@ -32,6 +32,7 @@ TMPDIR="$(mktemp -d)"
 
 pushd "$TMPDIR"
 
+# We do not use go install here as we don't want the behavior to implicitly depend on user-configured variables like $PATH
 git clone --depth=1 --single-branch --branch "$GETH_VERSION" "$GETH_REPO_URL"
 cd go-ethereum/cmd/abigen
 go build -ldflags="-s -w" # necessary on MacOS for code signing (see  https://github.com/confluentinc/confluent-kafka-go/issues/1092#issuecomment-2373681430)