[BUGFIX] fix panic when fetching dashbaords

Signed-off-by: Akshay Iyyadurai Balasundaram <akshay.iyyadurai.balasundaram@sap.com>

api/v1alpha1/perses_dashboard.go

@@ -1,20 +1,23 @@
 package v1alpha1
 
 import (
-	"github.com/barkimedes/go-deepcopy"
+	"encoding/json"
+
 	persesv1 "github.com/perses/perses/pkg/model/api/v1"
 )
 
 type Dashboard struct {
 	persesv1.DashboardSpec `json:",inline"`
 }
 
+// DeepCopyInto is a manually implemented deep copy function and this is required because:
+// 1. The embedded persesv1.DashboardSpec from the Perses project doesn't implement DeepCopyInto
+// 2. controller-gen can't automatically generate DeepCopy methods for types it doesn't own
 func (in *Dashboard) DeepCopyInto(out *Dashboard) {
-	temp, err := deepcopy.Anything(in)
-
-	if err != nil {
-		panic(err)
-	}
-
-	*out = *(temp.(*Dashboard))
+	*out = *in
+	// Create a deep copy of the embedded DashboardSpec
+	outSpec := persesv1.DashboardSpec{}
+	bytes, _ := json.Marshal(in.DashboardSpec)
+	_ = json.Unmarshal(bytes, &outSpec)
+	out.DashboardSpec = outSpec
 }