feat: added basic merge template function (#1438)

internal/templater/funcs.go

@@ -6,11 +6,10 @@ import (
 	"strings"
 	"text/template"
 
+	"github.com/davecgh/go-spew/spew"
 	"mvdan.cc/sh/v3/shell"
 	"mvdan.cc/sh/v3/syntax"
 
-	"github.com/davecgh/go-spew/spew"
-
 	sprig "github.com/go-task/slim-sprig/v3"
 )
 
@@ -54,6 +53,16 @@ func init() {
 		"relPath": func(basePath, targetPath string) (string, error) {
 			return filepath.Rel(basePath, targetPath)
 		},
+		"merge": func(a, b map[string]any) map[string]any {
+			m := make(map[string]any, len(a)+len(b))
+			for k, v := range a {
+				m[k] = v
+			}
+			for k, v := range b {
+				m[k] = v
+			}
+			return m
+		},
 		"spew": func(v any) string {
 			return spew.Sdump(v)
 		},