K8s release testing fix 2 (#376)

*Issue description:*
Follow up from
#375,
the `---` was missing between the Service and Deployment kind
deployment.

Output:

![image](https://github.com/user-attachments/assets/b81853ee-99e8-406d-878d-d026c294aaf9)


By submitting this pull request, I confirm that my contribution is made
under the terms of the Apache 2.0 license.

Author: harrryr

terraform/dotnet/k8s/deploy/main.tf

@@ -137,7 +137,7 @@ resource "null_resource" "deploy" {
 
         service_part=$(yq eval 'select(.kind == "Service")' dotnet-remote-service-depl.yaml)
         yq eval 'select(.kind == "Deployment") | .spec.template.spec.imagePullSecrets += {"name": "release-testing-ecr-secret"}' -i dotnet-remote-service-depl.yaml
-        echo "$service_part" >> dotnet-remote-service-depl.yaml
+        echo -e "\n---\n$service_part" >> dotnet-remote-service-depl.yaml
       fi
 
       echo "LOG: Applying sample app deployment files"

terraform/java/k8s/deploy/main.tf

@@ -138,7 +138,7 @@ resource "null_resource" "deploy" {
 
         service_part=$(yq eval 'select(.kind == "Service")' remote-service-depl.yaml)
         yq eval 'select(.kind == "Deployment") | .spec.template.spec.imagePullSecrets += {"name": "release-testing-ecr-secret"}' -i remote-service-depl.yaml
-        echo "$service_part" >> remote-service-depl.yaml
+        echo -e "\n---\n$service_part" >> remote-service-depl.yaml
       fi
 
       echo "LOG: Applying sample app deployment files"

terraform/node/k8s/deploy/main.tf

@@ -137,10 +137,10 @@ resource "null_resource" "deploy" {
           --docker-password="$${TOKEN}"
 
         yq eval '.spec.template.spec.imagePullSecrets += [{"name": "release-testing-ecr-secret"}]' -i frontend-service-depl.yaml
-        
+
         service_part=$(yq eval 'select(.kind == "Service")' remote-service-depl.yaml)
         yq eval 'select(.kind == "Deployment") | .spec.template.spec.imagePullSecrets += {"name": "release-testing-ecr-secret"}' -i remote-service-depl.yaml
-        echo "$service_part" >> remote-service-depl.yaml
+        echo -e "\n---\n$service_part" >> remote-service-depl.yaml
       fi
 
       echo "LOG: Applying sample app deployment files"

terraform/python/k8s/deploy/main.tf

@@ -139,7 +139,7 @@ resource "null_resource" "deploy" {
 
         service_part=$(yq eval 'select(.kind == "Service")' python-remote-service-depl.yaml)
         yq eval 'select(.kind == "Deployment") | .spec.template.spec.imagePullSecrets += {"name": "release-testing-ecr-secret"}' -i python-rremote-service-depl.yaml
-        echo "$service_part" >> python-rremote-service-depl.yaml
+        echo -e "\n---\n$service_part" >> python-remote-service-depl.yaml
       fi
 
       echo "LOG: Applying sample app deployment files"