feat: finds root (#7)

lua/neotest-bash/core/root_finder.lua

@@ -7,7 +7,19 @@ SpecBuilder = {}
 ---@param dir string @Directory to treat as cwd
 ---@return string | nil @Absolute root dir of test suite
 function SpecBuilder.findRoot(dir)
-	return lib.files.match_root_pattern("????")(dir)
+	-- TODO: check what happens when it's a single file
+	local matchers = {
+		".git",
+		"lib",
+	}
+	for _, matcher in ipairs(matchers) do
+		local root = lib.files.match_root_pattern(matcher)(dir)
+		if root then
+			return root
+		end
+	end
+
+	return nil
 end
 
 return SpecBuilder