chore: Return copied templates to prevent reference issues (#6679)

coderd/database/modelmethods.go

@@ -4,6 +4,8 @@ import (
 	"sort"
 	"strconv"
 
+	"golang.org/x/exp/maps"
+
 	"github.com/coder/coder/coderd/rbac"
 )
 
@@ -86,6 +88,13 @@ func (t Template) RBACObject() rbac.Object {
 		WithGroupACL(t.GroupACL)
 }
 
+func (t Template) DeepCopy() Template {
+	cpy := t
+	cpy.UserACL = maps.Clone(t.UserACL)
+	cpy.GroupACL = maps.Clone(t.GroupACL)
+	return cpy
+}
+
 func (TemplateVersion) RBACObject(template Template) rbac.Object {
 	// Just use the parent template resource for controlling versions
 	return template.RBACObject()