add the isignored file and fixed the ignore rules a bit

Signed-off-by: Danilo Patrucco <danilo.patrucco@gmail.com>

pkg/lint/lint.go

@@ -18,8 +18,6 @@ package lint
 
 import (
 	"path/filepath"
-	"os"
-
 	"helm.sh/helm/v3/pkg/chartutil"
 	"helm.sh/helm/v3/pkg/lint/rules"
 	"helm.sh/helm/v3/pkg/lint/support"

pkg/lint/rules/isignored.go

@@ -0,0 +1,23 @@
+package rules
+
+import (
+    "path/filepath"
+    "strings"
+)
+
+func IsIgnored(path string, patterns []string) bool {
+    for _, pattern := range patterns {
+        cleanedPath := filepath.Clean(path)
+        cleanedPattern := filepath.Clean(pattern)
+        if match, err := filepath.Match(cleanedPattern, cleanedPath); err == nil && match {
+            return true
+        }
+        if strings.HasSuffix(cleanedPattern, "/") || strings.HasSuffix(cleanedPattern, "\\") {
+            patternDir := strings.TrimRight(cleanedPattern, "/\\")
+            if strings.HasPrefix(cleanedPath, patternDir) {
+                return true
+            }
+        }
+    }
+    return false
+}