chore: import upstream snapshot with attribution

api/internal/randomstring/random_string.go

@@ -0,0 +1,14 @@
+package randomstring
+
+import "github.com/portainer/portainer/pkg/librand"
+
+const letterBytes = "abcdefghijklmnopqrstuvwxyz0123456789"
+
+// RandomString returns a random lowercase alphanumeric string of length n
+func RandomString(n int) string {
+	b := make([]byte, n)
+	for i := range b {
+		b[i] = letterBytes[librand.Intn(len(letterBytes))]
+	}
+	return string(b)
+}