fix(state): enhance error message for missing .gotmpl extension in helmfile v1 (#1989)

* fix(state): enhance error message for missing .gotmpl extension in helmfile

Signed-off-by: yxxhero <aiopsclub@163.com>

pkg/state/create.go

@@ -4,6 +4,7 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"path/filepath"
 	"slices"
 	"strings"
 
@@ -109,6 +110,9 @@ func (c *StateCreator) Parse(content []byte, baseDir, file string) (*HelmState,
 		if err == io.EOF {
 			break
 		} else if err != nil {
+			if filepath.Ext(file) != ".gotmpl" {
+				return nil, &StateLoadError{fmt.Sprintf("failed to read %s: reading document at index %d. Started seeing this since Helmfile v1? Add the .gotmpl file extension", file, i), err}
+			}
 			return nil, &StateLoadError{fmt.Sprintf("failed to read %s: reading document at index %d", file, i), err}
 		}