fix: use empty spec for addons that were missing template.cue

Signed-off-by: florent.madiot.e <florent.madiot.e@thalesdigital.io>

Author: scodeman

addons/o11y-definitions/template.cue

@@ -1,3 +1,9 @@
 package main
 
-output: {}
+output: {
+	apiVersion: "core.oam.dev/v1beta1"
+	kind:       "Application"
+	spec: {
+		components: []
+    }
+}

addons/vegeta/template.cue

@@ -1,3 +1,9 @@
 package main
 
-output: {}
+output: {
+	apiVersion: "core.oam.dev/v1beta1"
+	kind:       "Application"
+	spec: {
+		components: []
+    }
+}

experimental/addons/canary-rollout-istio/template.cue

@@ -1,3 +1,9 @@
 package main
 
-output : {}
+output: {
+	apiVersion: "core.oam.dev/v1beta1"
+	kind:       "Application"
+	spec: {
+		components: []
+    }
+}

experimental/addons/envoy-gateway/template.cue

@@ -1,3 +1,9 @@
 package main
 
-output : {}
+output: {
+	apiVersion: "core.oam.dev/v1beta1"
+	kind:       "Application"
+	spec: {
+		components: []
+    }
+}

experimental/addons/vector-config/template.cue

@@ -1,3 +1,9 @@
 package main
 
-output : {}
+output: {
+	apiVersion: "core.oam.dev/v1beta1"
+	kind:       "Application"
+	spec: {
+		components: []
+    }
+}